Finding the Fourth Proportional to 1,524.57, 2,103.89 and 861.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,524.57 : 2,103.89 = 861.55 : x
2. Step 2: Convert to fraction form
   1,524.57/2,103.89 = 861.55/x
3. Step 3: Cross multiply
   1,524.57x = 2,103.89 × 861.55
4. Step 4: Simplify right side
   1,524.57x = 1,812,601.71
5. Step 5: Solve for x
   x = 1,812,601.71/1,524.57
6. Step 6: Final answer
   x = 1,188.93