Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_78668 ( "City" text, "1860" text, "1870" text, "1880" text, "1890" real, "1900" real, "1910" real, "1920" real )

### Question ###
What is the 1920 number when 1890 is greater than 1,236, 1910 is less than 1,177 and the city is Vacaville?

### Accurate SQL ###

SELECT SUM("1920") FROM table_78668 WHERE "1890" > '1,236' AND "City" = 'vacaville' AND "1910" < '1,177'