Finding the Fourth Proportional to 23,109.12, 31,890.42 and 12,498.72

Step by Step Solution

1. Step 1: Write the proportion equation
   23,109.12 : 31,890.42 = 12,498.72 : x
2. Step 2: Convert to fraction form
   23,109.12/31,890.42 = 12,498.72/x
3. Step 3: Cross multiply
   23,109.12x = 31,890.42 × 12,498.72
4. Step 4: Simplify right side
   23,109.12x = 398,589,430.26
5. Step 5: Solve for x
   x = 398,589,430.26/23,109.12
6. Step 6: Final answer
   x = 17,248.14