Finding the Fourth Proportional to 1,124.18, 1,683.53 and 685.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,124.18 : 1,683.53 = 685.72 : x
2. Step 2: Convert to fraction form
   1,124.18/1,683.53 = 685.72/x
3. Step 3: Cross multiply
   1,124.18x = 1,683.53 × 685.72
4. Step 4: Simplify right side
   1,124.18x = 1,154,425.83
5. Step 5: Solve for x
   x = 1,154,425.83/1,124.18
6. Step 6: Final answer
   x = 1,026.91