Finding the Fourth Proportional to 1,008.63, 1,391.94 and 566.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.63 : 1,391.94 = 566.55 : x
2. Step 2: Convert to fraction form
   1,008.63/1,391.94 = 566.55/x
3. Step 3: Cross multiply
   1,008.63x = 1,391.94 × 566.55
4. Step 4: Simplify right side
   1,008.63x = 788,603.61
5. Step 5: Solve for x
   x = 788,603.61/1,008.63
6. Step 6: Final answer
   x = 781.86