Finding the Third Proportional to 81,811.69 and 171,072

Step by Step Solution

1. Step 1: Write the proportion equation
   81,811.69 : 171,072 = 171,072 : x
2. Step 2: Convert to fraction form
   81,811.69/171,072 = 171,072/x
3. Step 3: Cross multiply
   81,811.69x = 171,072 × 171,072
4. Step 4: Simplify right side
   81,811.69x = 29,265,629,184
5. Step 5: Solve for x
   x = 29,265,629,184/81,811.69
6. Step 6: Final answer
   x = 357,719.42