Finding the Fourth Proportional to 1,008.62, 1,513.29 and 521.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.62 : 1,513.29 = 521.99 : x
2. Step 2: Convert to fraction form
   1,008.62/1,513.29 = 521.99/x
3. Step 3: Cross multiply
   1,008.62x = 1,513.29 × 521.99
4. Step 4: Simplify right side
   1,008.62x = 789,922.25
5. Step 5: Solve for x
   x = 789,922.25/1,008.62
6. Step 6: Final answer
   x = 783.17