Finding the Third Proportional to 38,699.86 and 79,039.97

Step by Step Solution

1. Step 1: Write the proportion equation
   38,699.86 : 79,039.97 = 79,039.97 : x
2. Step 2: Convert to fraction form
   38,699.86/79,039.97 = 79,039.97/x
3. Step 3: Cross multiply
   38,699.86x = 79,039.97 × 79,039.97
4. Step 4: Simplify right side
   38,699.86x = 6,247,316,660.00
5. Step 5: Solve for x
   x = 6,247,316,660.00/38,699.86
6. Step 6: Final answer
   x = 161,429.96