Finding the Third Proportional to 12,139.88 and 16,400.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.88 : 16,400.81 = 16,400.81 : x
2. Step 2: Convert to fraction form
   12,139.88/16,400.81 = 16,400.81/x
3. Step 3: Cross multiply
   12,139.88x = 16,400.81 × 16,400.81
4. Step 4: Simplify right side
   12,139.88x = 268,986,650.66
5. Step 5: Solve for x
   x = 268,986,650.66/12,139.88
6. Step 6: Final answer
   x = 22,157.28