Finding the Fourth Proportional to 9,106.86, 12,567.70 and 5,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,106.86 : 12,567.70 = 5,128.12 : x
2. Step 2: Convert to fraction form
   9,106.86/12,567.70 = 5,128.12/x
3. Step 3: Cross multiply
   9,106.86x = 12,567.70 × 5,128.12
4. Step 4: Simplify right side
   9,106.86x = 64,448,673.72
5. Step 5: Solve for x
   x = 64,448,673.72/9,106.86
6. Step 6: Final answer
   x = 7,076.94