Finding the Fourth Proportional to 1,128.43, 1,557.17 and 656.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.43 : 1,557.17 = 656.29 : x
2. Step 2: Convert to fraction form
   1,128.43/1,557.17 = 656.29/x
3. Step 3: Cross multiply
   1,128.43x = 1,557.17 × 656.29
4. Step 4: Simplify right side
   1,128.43x = 1,021,951.82
5. Step 5: Solve for x
   x = 1,021,951.82/1,128.43
6. Step 6: Final answer
   x = 905.64