Finding the Fourth Proportional to 22,139.78, 30,553.47 and 12,579.35

Step by Step Solution

1. Step 1: Write the proportion equation
   22,139.78 : 30,553.47 = 12,579.35 : x
2. Step 2: Convert to fraction form
   22,139.78/30,553.47 = 12,579.35/x
3. Step 3: Cross multiply
   22,139.78x = 30,553.47 × 12,579.35
4. Step 4: Simplify right side
   22,139.78x = 384,342,729.95
5. Step 5: Solve for x
   x = 384,342,729.95/22,139.78
6. Step 6: Final answer
   x = 17,359.83