Finding the Fourth Proportional to 22,621.89, 31,218.30 and 12,550.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,621.89 : 31,218.30 = 12,550.31 : x
2. Step 2: Convert to fraction form
   22,621.89/31,218.30 = 12,550.31/x
3. Step 3: Cross multiply
   22,621.89x = 31,218.30 × 12,550.31
4. Step 4: Simplify right side
   22,621.89x = 391,799,186.58
5. Step 5: Solve for x
   x = 391,799,186.58/22,621.89
6. Step 6: Final answer
   x = 17,319.47