Finding the Third Proportional to 18,781.88 and 39,659.63

Step by Step Solution

1. Step 1: Write the proportion equation
   18,781.88 : 39,659.63 = 39,659.63 : x
2. Step 2: Convert to fraction form
   18,781.88/39,659.63 = 39,659.63/x
3. Step 3: Cross multiply
   18,781.88x = 39,659.63 × 39,659.63
4. Step 4: Simplify right side
   18,781.88x = 1,572,885,855.14
5. Step 5: Solve for x
   x = 1,572,885,855.14/18,781.88
6. Step 6: Final answer
   x = 83,744.88