Finding the Third Proportional to 38,879.63 and 81,909.75

Step by Step Solution

1. Step 1: Write the proportion equation
   38,879.63 : 81,909.75 = 81,909.75 : x
2. Step 2: Convert to fraction form
   38,879.63/81,909.75 = 81,909.75/x
3. Step 3: Cross multiply
   38,879.63x = 81,909.75 × 81,909.75
4. Step 4: Simplify right side
   38,879.63x = 6,709,207,145.06
5. Step 5: Solve for x
   x = 6,709,207,145.06/38,879.63
6. Step 6: Final answer
   x = 172,563.58