Finding the Fourth Proportional to 23,100.23, 31,878.34 and 12,489.86

Step by Step Solution

1. Step 1: Write the proportion equation
   23,100.23 : 31,878.34 = 12,489.86 : x
2. Step 2: Convert to fraction form
   23,100.23/31,878.34 = 12,489.86/x
3. Step 3: Cross multiply
   23,100.23x = 31,878.34 × 12,489.86
4. Step 4: Simplify right side
   23,100.23x = 398,156,052.10
5. Step 5: Solve for x
   x = 398,156,052.10/23,100.23
6. Step 6: Final answer
   x = 17,236.02