Finding the Third Proportional to 81,105.75 and 173,421

Step by Step Solution

1. Step 1: Write the proportion equation
   81,105.75 : 173,421 = 173,421 : x
2. Step 2: Convert to fraction form
   81,105.75/173,421 = 173,421/x
3. Step 3: Cross multiply
   81,105.75x = 173,421 × 173,421
4. Step 4: Simplify right side
   81,105.75x = 30,074,843,241
5. Step 5: Solve for x
   x = 30,074,843,241/81,105.75
6. Step 6: Final answer
   x = 370,810.25