Finding the Fourth Proportional to 1,123.50, 1,550.57 and 657.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.50 : 1,550.57 = 657.75 : x
2. Step 2: Convert to fraction form
   1,123.50/1,550.57 = 657.75/x
3. Step 3: Cross multiply
   1,123.50x = 1,550.57 × 657.75
4. Step 4: Simplify right side
   1,123.50x = 1,019,887.42
5. Step 5: Solve for x
   x = 1,019,887.42/1,123.50
6. Step 6: Final answer
   x = 907.78