Finding the Fourth Proportional to 9,108.45, 12,570.39 and 5,129.33

Step by Step Solution

1. Step 1: Write the proportion equation
   9,108.45 : 12,570.39 = 5,129.33 : x
2. Step 2: Convert to fraction form
   9,108.45/12,570.39 = 5,129.33/x
3. Step 3: Cross multiply
   9,108.45x = 12,570.39 × 5,129.33
4. Step 4: Simplify right side
   9,108.45x = 64,477,615.69
5. Step 5: Solve for x
   x = 64,477,615.69/9,108.45
6. Step 6: Final answer
   x = 7,078.88