Finding the Fourth Proportional to 1,008.72, 1,392.03 and 566.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.72 : 1,392.03 = 566.55 : x
2. Step 2: Convert to fraction form
   1,008.72/1,392.03 = 566.55/x
3. Step 3: Cross multiply
   1,008.72x = 1,392.03 × 566.55
4. Step 4: Simplify right side
   1,008.72x = 788,654.60
5. Step 5: Solve for x
   x = 788,654.60/1,008.72
6. Step 6: Final answer
   x = 781.84