Finding the Fourth Proportional to 22,938.89, 31,659.20 and 12,871.40

Step by Step Solution

1. Step 1: Write the proportion equation
   22,938.89 : 31,659.20 = 12,871.40 : x
2. Step 2: Convert to fraction form
   22,938.89/31,659.20 = 12,871.40/x
3. Step 3: Cross multiply
   22,938.89x = 31,659.20 × 12,871.40
4. Step 4: Simplify right side
   22,938.89x = 407,498,004.23
5. Step 5: Solve for x
   x = 407,498,004.23/22,938.89
6. Step 6: Final answer
   x = 17,764.51