Finding the Fourth Proportional to 1,123.40, 1,687.85 and 1,061.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.40 : 1,687.85 = 1,061.24 : x
2. Step 2: Convert to fraction form
   1,123.40/1,687.85 = 1,061.24/x
3. Step 3: Cross multiply
   1,123.40x = 1,687.85 × 1,061.24
4. Step 4: Simplify right side
   1,123.40x = 1,791,200.19
5. Step 5: Solve for x
   x = 1,791,200.19/1,123.40
6. Step 6: Final answer
   x = 1,594.45