Finding the Fourth Proportional to 9,142.74, 12,618.18 and 5,165.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,142.74 : 12,618.18 = 5,165.10 : x
2. Step 2: Convert to fraction form
   9,142.74/12,618.18 = 5,165.10/x
3. Step 3: Cross multiply
   9,142.74x = 12,618.18 × 5,165.10
4. Step 4: Simplify right side
   9,142.74x = 65,174,161.52
5. Step 5: Solve for x
   x = 65,174,161.52/9,142.74
6. Step 6: Final answer
   x = 7,128.52