Finding the Fourth Proportional to 23,109.79, 31,891.52 and 12,499.42

Step by Step Solution

1. Step 1: Write the proportion equation
   23,109.79 : 31,891.52 = 12,499.42 : x
2. Step 2: Convert to fraction form
   23,109.79/31,891.52 = 12,499.42/x
3. Step 3: Cross multiply
   23,109.79x = 31,891.52 × 12,499.42
4. Step 4: Simplify right side
   23,109.79x = 398,625,502.92
5. Step 5: Solve for x
   x = 398,625,502.92/23,109.79
6. Step 6: Final answer
   x = 17,249.20