Finding the Fourth Proportional to 12,499.66, 17,242.52 and 7,717.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,499.66 : 17,242.52 = 7,717.42 : x
2. Step 2: Convert to fraction form
   12,499.66/17,242.52 = 7,717.42/x
3. Step 3: Cross multiply
   12,499.66x = 17,242.52 × 7,717.42
4. Step 4: Simplify right side
   12,499.66x = 133,067,768.70
5. Step 5: Solve for x
   x = 133,067,768.70/12,499.66
6. Step 6: Final answer
   x = 10,645.71