Finding the Fourth Proportional to 9,137.72, 12,610.46 and 5,158.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,137.72 : 12,610.46 = 5,158.87 : x
2. Step 2: Convert to fraction form
   9,137.72/12,610.46 = 5,158.87/x
3. Step 3: Cross multiply
   9,137.72x = 12,610.46 × 5,158.87
4. Step 4: Simplify right side
   9,137.72x = 65,055,705.15
5. Step 5: Solve for x
   x = 65,055,705.15/9,137.72
6. Step 6: Final answer
   x = 7,119.47