Finding the Fourth Proportional to 22,419.46, 30,938.96 and 12,859.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,419.46 : 30,938.96 = 12,859.72 : x
2. Step 2: Convert to fraction form
   22,419.46/30,938.96 = 12,859.72/x
3. Step 3: Cross multiply
   22,419.46x = 30,938.96 × 12,859.72
4. Step 4: Simplify right side
   22,419.46x = 397,866,362.69
5. Step 5: Solve for x
   x = 397,866,362.69/22,419.46
6. Step 6: Final answer
   x = 17,746.47