Harvard Medical School's website provides calorie expenditure estimates for weight training. A 30-minute weight-training session burns about 90 calories if you weigh 125 pounds. If you weigh 155 pounds, the same weight-training session will result in 112 calories burned. Aerobic exercises burn calories at a notably quicker rate than weight lifting.
Note that this is a ratio, not the formulae you are looking for. So, a 15:5:15 ratio would be ideal (note the ratio of 3:1:3). The company Scotts has just released what appears to be an ideal palm fertilizer with microelements, magnesium and calcium. Consider buying a slow release fertilizer. It is more expensive but probably better for the plants and less labor intensive.
The area should have organic nutrients over a large area since palm tree roots will spread and should have access to these nutrients many feet from the trunk. Take care not to bury the trunk in soil when planting a palm tree, as this could cause rot. Water the root ball before back filling the hole. Spread mulch several feet from the trunk out around the root zone to provide supplemental nourishment over time as it composts. Replace the mulch annually.