Finding the Fourth Proportional to 9,106.16, 12,567.11 and 5,128.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,106.16 : 12,567.11 = 5,128.25 : x
2. Step 2: Convert to fraction form
   9,106.16/12,567.11 = 5,128.25/x
3. Step 3: Cross multiply
   9,106.16x = 12,567.11 × 5,128.25
4. Step 4: Simplify right side
   9,106.16x = 64,447,193.38
5. Step 5: Solve for x
   x = 64,447,193.38/9,106.16
6. Step 6: Final answer
   x = 7,077.32