Finding the Fourth Proportional to 9,106.29, 12,567.45 and 5,128.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,106.29 : 12,567.45 = 5,128.18 : x
2. Step 2: Convert to fraction form
   9,106.29/12,567.45 = 5,128.18/x
3. Step 3: Cross multiply
   9,106.29x = 12,567.45 × 5,128.18
4. Step 4: Simplify right side
   9,106.29x = 64,448,133.55
5. Step 5: Solve for x
   x = 64,448,133.55/9,106.29
6. Step 6: Final answer
   x = 7,077.32