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.
Coconut palms perform best when grown in full sun with moderately moist, fast-draining soil. Soil pH is not an issue, nor is soil salinity. Occasional flooding does not hurt coconut palm roots, but consistently submerged soil will eventually kill the tree. In areas where temperatures below 40 degrees Fahrenheit are common, plant coconut palms in a sheltered area against a south-facing wall to minimize cold damage.