Finding the Fourth Proportional to 21,842.18, 30,139.16 and 12,280.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,842.18 : 30,139.16 = 12,280.74 : x
2. Step 2: Convert to fraction form
   21,842.18/30,139.16 = 12,280.74/x
3. Step 3: Cross multiply
   21,842.18x = 30,139.16 × 12,280.74
4. Step 4: Simplify right side
   21,842.18x = 370,131,187.78
5. Step 5: Solve for x
   x = 370,131,187.78/21,842.18
6. Step 6: Final answer
   x = 16,945.71