Finding the Fourth Proportional to 9,155.72, 12,635.36 and 5,379.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,155.72 : 12,635.36 = 5,379.10 : x
2. Step 2: Convert to fraction form
   9,155.72/12,635.36 = 5,379.10/x
3. Step 3: Cross multiply
   9,155.72x = 12,635.36 × 5,379.10
4. Step 4: Simplify right side
   9,155.72x = 67,966,864.98
5. Step 5: Solve for x
   x = 67,966,864.98/9,155.72
6. Step 6: Final answer
   x = 7,423.43