Finding the Fourth Proportional to 1,008.57, 1,513.29 and 521.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.57 : 1,513.29 = 521.34 : x
2. Step 2: Convert to fraction form
   1,008.57/1,513.29 = 521.34/x
3. Step 3: Cross multiply
   1,008.57x = 1,513.29 × 521.34
4. Step 4: Simplify right side
   1,008.57x = 788,938.61
5. Step 5: Solve for x
   x = 788,938.61/1,008.57
6. Step 6: Final answer
   x = 782.23