Finding the Fourth Proportional to 9,107.72, 12,567.61 and 5,128.73

Step by Step Solution

1. Step 1: Write the proportion equation
   9,107.72 : 12,567.61 = 5,128.73 : x
2. Step 2: Convert to fraction form
   9,107.72/12,567.61 = 5,128.73/x
3. Step 3: Cross multiply
   9,107.72x = 12,567.61 × 5,128.73
4. Step 4: Simplify right side
   9,107.72x = 64,455,878.44
5. Step 5: Solve for x
   x = 64,455,878.44/9,107.72
6. Step 6: Final answer
   x = 7,077.06