Finding the Fourth Proportional to 23,100.29, 31,878.45 and 12,489.96

Step by Step Solution

1. Step 1: Write the proportion equation
   23,100.29 : 31,878.45 = 12,489.96 : x
2. Step 2: Convert to fraction form
   23,100.29/31,878.45 = 12,489.96/x
3. Step 3: Cross multiply
   23,100.29x = 31,878.45 × 12,489.96
4. Step 4: Simplify right side
   23,100.29x = 398,160,502.91
5. Step 5: Solve for x
   x = 398,160,502.91/23,100.29
6. Step 6: Final answer
   x = 17,236.17