Finding the Fourth Proportional to 9,108.32, 12,568.16 and 5,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,108.32 : 12,568.16 = 5,128.72 : x
2. Step 2: Convert to fraction form
   9,108.32/12,568.16 = 5,128.72/x
3. Step 3: Cross multiply
   9,108.32x = 12,568.16 × 5,128.72
4. Step 4: Simplify right side
   9,108.32x = 64,458,573.56
5. Step 5: Solve for x
   x = 64,458,573.56/9,108.32
6. Step 6: Final answer
   x = 7,076.89