Finding the Fourth Proportional to 1,128.45, 1,557.35 and 656.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.45 : 1,557.35 = 656.49 : x
2. Step 2: Convert to fraction form
   1,128.45/1,557.35 = 656.49/x
3. Step 3: Cross multiply
   1,128.45x = 1,557.35 × 656.49
4. Step 4: Simplify right side
   1,128.45x = 1,022,381.42
5. Step 5: Solve for x
   x = 1,022,381.42/1,128.45
6. Step 6: Final answer
   x = 906.01