Finding the Fourth Proportional to 16,213.49, 22,374.31 and 9,139.91

Step by Step Solution

1. Step 1: Write the proportion equation
   16,213.49 : 22,374.31 = 9,139.91 : x
2. Step 2: Convert to fraction form
   16,213.49/22,374.31 = 9,139.91/x
3. Step 3: Cross multiply
   16,213.49x = 22,374.31 × 9,139.91
4. Step 4: Simplify right side
   16,213.49x = 204,499,134.01
5. Step 5: Solve for x
   x = 204,499,134.01/16,213.49
6. Step 6: Final answer
   x = 12,612.90