Finding the Fourth Proportional to 10,391.98, 15,585.54 and 5,124.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,391.98 : 15,585.54 = 5,124.55 : x
2. Step 2: Convert to fraction form
   10,391.98/15,585.54 = 5,124.55/x
3. Step 3: Cross multiply
   10,391.98x = 15,585.54 × 5,124.55
4. Step 4: Simplify right side
   10,391.98x = 79,868,879.01
5. Step 5: Solve for x
   x = 79,868,879.01/10,391.98
6. Step 6: Final answer
   x = 7,685.63