Finding the Fourth Proportional to 9,107.56, 12,567.86 and 5,128.44

Step by Step Solution

1. Step 1: Write the proportion equation
   9,107.56 : 12,567.86 = 5,128.44 : x
2. Step 2: Convert to fraction form
   9,107.56/12,567.86 = 5,128.44/x
3. Step 3: Cross multiply
   9,107.56x = 12,567.86 × 5,128.44
4. Step 4: Simplify right side
   9,107.56x = 64,453,515.94
5. Step 5: Solve for x
   x = 64,453,515.94/9,107.56
6. Step 6: Final answer
   x = 7,076.92