Finding the Fourth Proportional to 9,158.74, 12,639.00 and 5,125.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.74 : 12,639.00 = 5,125.57 : x
2. Step 2: Convert to fraction form
   9,158.74/12,639.00 = 5,125.57/x
3. Step 3: Cross multiply
   9,158.74x = 12,639.00 × 5,125.57
4. Step 4: Simplify right side
   9,158.74x = 64,782,053.60
5. Step 5: Solve for x
   x = 64,782,053.60/9,158.74
6. Step 6: Final answer
   x = 7,073.25