Finding the Fourth Proportional to 1,008.31, 1,391.55 and 566.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.31 : 1,391.55 = 566.35 : x
2. Step 2: Convert to fraction form
   1,008.31/1,391.55 = 566.35/x
3. Step 3: Cross multiply
   1,008.31x = 1,391.55 × 566.35
4. Step 4: Simplify right side
   1,008.31x = 788,104.34
5. Step 5: Solve for x
   x = 788,104.34/1,008.31
6. Step 6: Final answer
   x = 781.61