Finding the Fourth Proportional to 1,123.88, 1,685.82 and 611.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.88 : 1,685.82 = 611.24 : x
2. Step 2: Convert to fraction form
   1,123.88/1,685.82 = 611.24/x
3. Step 3: Cross multiply
   1,123.88x = 1,685.82 × 611.24
4. Step 4: Simplify right side
   1,123.88x = 1,030,440.62
5. Step 5: Solve for x
   x = 1,030,440.62/1,123.88
6. Step 6: Final answer
   x = 916.86