Finding the Fourth Proportional to 21,280.50, 31,949.01 and 18,180.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,280.50 : 31,949.01 = 18,180.42 : x
2. Step 2: Convert to fraction form
   21,280.50/31,949.01 = 18,180.42/x
3. Step 3: Cross multiply
   21,280.50x = 31,949.01 × 18,180.42
4. Step 4: Simplify right side
   21,280.50x = 580,846,420.38
5. Step 5: Solve for x
   x = 580,846,420.38/21,280.50
6. Step 6: Final answer
   x = 27,294.77