Finding the Fourth Proportional to 9,128.43, 12,597.57 and 5,149.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.43 : 12,597.57 = 5,149.71 : x
2. Step 2: Convert to fraction form
   9,128.43/12,597.57 = 5,149.71/x
3. Step 3: Cross multiply
   9,128.43x = 12,597.57 × 5,149.71
4. Step 4: Simplify right side
   9,128.43x = 64,873,832.20
5. Step 5: Solve for x
   x = 64,873,832.20/9,128.43
6. Step 6: Final answer
   x = 7,106.79