Finding the Third Proportional to 10,639.88 and 14,909.63

Step by Step Solution

1. Step 1: Write the proportion equation
   10,639.88 : 14,909.63 = 14,909.63 : x
2. Step 2: Convert to fraction form
   10,639.88/14,909.63 = 14,909.63/x
3. Step 3: Cross multiply
   10,639.88x = 14,909.63 × 14,909.63
4. Step 4: Simplify right side
   10,639.88x = 222,296,917.64
5. Step 5: Solve for x
   x = 222,296,917.64/10,639.88
6. Step 6: Final answer
   x = 20,892.81