Finding the Fourth Proportional to 9,107.17, 12,567.71 and 5,128.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,107.17 : 12,567.71 = 5,128.20 : x
2. Step 2: Convert to fraction form
   9,107.17/12,567.71 = 5,128.20/x
3. Step 3: Cross multiply
   9,107.17x = 12,567.71 × 5,128.20
4. Step 4: Simplify right side
   9,107.17x = 64,449,730.42
5. Step 5: Solve for x
   x = 64,449,730.42/9,107.17
6. Step 6: Final answer
   x = 7,076.81