Finding the Fourth Proportional to 9,158.73, 12,639.50 and 5,382.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.73 : 12,639.50 = 5,382.10 : x
2. Step 2: Convert to fraction form
   9,158.73/12,639.50 = 5,382.10/x
3. Step 3: Cross multiply
   9,158.73x = 12,639.50 × 5,382.10
4. Step 4: Simplify right side
   9,158.73x = 68,027,052.95
5. Step 5: Solve for x
   x = 68,027,052.95/9,158.73
6. Step 6: Final answer
   x = 7,427.56