Finding the Fourth Proportional to 23,100.12, 31,878.02 and 12,489.64

Step by Step Solution

1. Step 1: Write the proportion equation
   23,100.12 : 31,878.02 = 12,489.64 : x
2. Step 2: Convert to fraction form
   23,100.12/31,878.02 = 12,489.64/x
3. Step 3: Cross multiply
   23,100.12x = 31,878.02 × 12,489.64
4. Step 4: Simplify right side
   23,100.12x = 398,144,993.71
5. Step 5: Solve for x
   x = 398,144,993.71/23,100.12
6. Step 6: Final answer
   x = 17,235.62