Finding the Fourth Proportional to 1,123.62, 1,550.37 and 657.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.62 : 1,550.37 = 657.78 : x
2. Step 2: Convert to fraction form
   1,123.62/1,550.37 = 657.78/x
3. Step 3: Cross multiply
   1,123.62x = 1,550.37 × 657.78
4. Step 4: Simplify right side
   1,123.62x = 1,019,802.38
5. Step 5: Solve for x
   x = 1,019,802.38/1,123.62
6. Step 6: Final answer
   x = 907.60