Finding the Fourth Proportional to 1,123.64, 1,550.75 and 657.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.64 : 1,550.75 = 657.89 : x
2. Step 2: Convert to fraction form
   1,123.64/1,550.75 = 657.89/x
3. Step 3: Cross multiply
   1,123.64x = 1,550.75 × 657.89
4. Step 4: Simplify right side
   1,123.64x = 1,020,211.87
5. Step 5: Solve for x
   x = 1,020,211.87/1,123.64
6. Step 6: Final answer
   x = 907.96