Finding the Fourth Proportional to 21,901.77, 30,224.43 and 12,470.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,901.77 : 30,224.43 = 12,470.31 : x
2. Step 2: Convert to fraction form
   21,901.77/30,224.43 = 12,470.31/x
3. Step 3: Cross multiply
   21,901.77x = 30,224.43 × 12,470.31
4. Step 4: Simplify right side
   21,901.77x = 376,908,011.67
5. Step 5: Solve for x
   x = 376,908,011.67/21,901.77
6. Step 6: Final answer
   x = 17,209.02