Finding the Fourth Proportional to 21,901.55, 30,224.17 and 12,470.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,901.55 : 30,224.17 = 12,470.12 : x
2. Step 2: Convert to fraction form
   21,901.55/30,224.17 = 12,470.12/x
3. Step 3: Cross multiply
   21,901.55x = 30,224.17 × 12,470.12
4. Step 4: Simplify right side
   21,901.55x = 376,899,026.80
5. Step 5: Solve for x
   x = 376,899,026.80/21,901.55
6. Step 6: Final answer
   x = 17,208.78