Finding the Fourth Proportional to 1,123.52, 1,677.24 and 1,115.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.52 : 1,677.24 = 1,115.76 : x
2. Step 2: Convert to fraction form
   1,123.52/1,677.24 = 1,115.76/x
3. Step 3: Cross multiply
   1,123.52x = 1,677.24 × 1,115.76
4. Step 4: Simplify right side
   1,123.52x = 1,871,397.30
5. Step 5: Solve for x
   x = 1,871,397.30/1,123.52
6. Step 6: Final answer
   x = 1,665.66