Finding the Third Proportional to 39,885.75 and 81,820.13

Step by Step Solution

1. Step 1: Write the proportion equation
   39,885.75 : 81,820.13 = 81,820.13 : x
2. Step 2: Convert to fraction form
   39,885.75/81,820.13 = 81,820.13/x
3. Step 3: Cross multiply
   39,885.75x = 81,820.13 × 81,820.13
4. Step 4: Simplify right side
   39,885.75x = 6,694,532,855.02
5. Step 5: Solve for x
   x = 6,694,532,855.02/39,885.75
6. Step 6: Final answer
   x = 167,842.72