Finding the Fourth Proportional to 22,418.30, 30,938.28 and 12,861.02

Step by Step Solution

1. Step 1: Write the proportion equation
   22,418.30 : 30,938.28 = 12,861.02 : x
2. Step 2: Convert to fraction form
   22,418.30/30,938.28 = 12,861.02/x
3. Step 3: Cross multiply
   22,418.30x = 30,938.28 × 12,861.02
4. Step 4: Simplify right side
   22,418.30x = 397,897,837.85
5. Step 5: Solve for x
   x = 397,897,837.85/22,418.30
6. Step 6: Final answer
   x = 17,748.80