Finding the Fourth Proportional to 9,155.91, 12,635.69 and 5,177.39

Step by Step Solution

1. Step 1: Write the proportion equation
   9,155.91 : 12,635.69 = 5,177.39 : x
2. Step 2: Convert to fraction form
   9,155.91/12,635.69 = 5,177.39/x
3. Step 3: Cross multiply
   9,155.91x = 12,635.69 × 5,177.39
4. Step 4: Simplify right side
   9,155.91x = 65,419,900.75
5. Step 5: Solve for x
   x = 65,419,900.75/9,155.91
6. Step 6: Final answer
   x = 7,145.10