Finding the Fourth Proportional to 22,419.78, 30,938.10 and 12,859.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,419.78 : 30,938.10 = 12,859.16 : x
2. Step 2: Convert to fraction form
   22,419.78/30,938.10 = 12,859.16/x
3. Step 3: Cross multiply
   22,419.78x = 30,938.10 × 12,859.16
4. Step 4: Simplify right side
   22,419.78x = 397,837,978.00
5. Step 5: Solve for x
   x = 397,837,978.00/22,419.78
6. Step 6: Final answer
   x = 17,744.95