Finding the Fourth Proportional to 9,149.31, 12,623.94 and 5,372.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,149.31 : 12,623.94 = 5,372.28 : x
2. Step 2: Convert to fraction form
   9,149.31/12,623.94 = 5,372.28/x
3. Step 3: Cross multiply
   9,149.31x = 12,623.94 × 5,372.28
4. Step 4: Simplify right side
   9,149.31x = 67,819,340.38
5. Step 5: Solve for x
   x = 67,819,340.38/9,149.31
6. Step 6: Final answer
   x = 7,412.51