Finding the Fourth Proportional to 9,144.50, 12,620.43 and 5,165.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.50 : 12,620.43 = 5,165.87 : x
2. Step 2: Convert to fraction form
   9,144.50/12,620.43 = 5,165.87/x
3. Step 3: Cross multiply
   9,144.50x = 12,620.43 × 5,165.87
4. Step 4: Simplify right side
   9,144.50x = 65,195,455.20
5. Step 5: Solve for x
   x = 65,195,455.20/9,144.50
6. Step 6: Final answer
   x = 7,129.48