Finding the Fourth Proportional to 11,607.72, 17,380.68 and 7,917.24

Step by Step Solution

1. Step 1: Write the proportion equation
   11,607.72 : 17,380.68 = 7,917.24 : x
2. Step 2: Convert to fraction form
   11,607.72/17,380.68 = 7,917.24/x
3. Step 3: Cross multiply
   11,607.72x = 17,380.68 × 7,917.24
4. Step 4: Simplify right side
   11,607.72x = 137,607,014.92
5. Step 5: Solve for x
   x = 137,607,014.92/11,607.72
6. Step 6: Final answer
   x = 11,854.78