Finding the Fourth Proportional to 9,108.72, 12,570.26 and 5,129.97

Step by Step Solution

1. Step 1: Write the proportion equation
   9,108.72 : 12,570.26 = 5,129.97 : x
2. Step 2: Convert to fraction form
   9,108.72/12,570.26 = 5,129.97/x
3. Step 3: Cross multiply
   9,108.72x = 12,570.26 × 5,129.97
4. Step 4: Simplify right side
   9,108.72x = 64,485,056.69
5. Step 5: Solve for x
   x = 64,485,056.69/9,108.72
6. Step 6: Final answer
   x = 7,079.49