Finding the Fourth Proportional to 22,419.51, 30,938.31 and 12,861

Step by Step Solution

1. Step 1: Write the proportion equation
   22,419.51 : 30,938.31 = 12,861 : x
2. Step 2: Convert to fraction form
   22,419.51/30,938.31 = 12,861/x
3. Step 3: Cross multiply
   22,419.51x = 30,938.31 × 12,861
4. Step 4: Simplify right side
   22,419.51x = 397,897,604.91
5. Step 5: Solve for x
   x = 397,897,604.91/22,419.51
6. Step 6: Final answer
   x = 17,747.83