Finding the Fourth Proportional to 1,128.27, 1,557.10 and 656.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.27 : 1,557.10 = 656.31 : x
2. Step 2: Convert to fraction form
   1,128.27/1,557.10 = 656.31/x
3. Step 3: Cross multiply
   1,128.27x = 1,557.10 × 656.31
4. Step 4: Simplify right side
   1,128.27x = 1,021,940.30
5. Step 5: Solve for x
   x = 1,021,940.30/1,128.27
6. Step 6: Final answer
   x = 905.76