Finding the Third Proportional to 73,693.50 and 173,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   73,693.50 : 173,221.50 = 173,221.50 : x
2. Step 2: Convert to fraction form
   73,693.50/173,221.50 = 173,221.50/x
3. Step 3: Cross multiply
   73,693.50x = 173,221.50 × 173,221.50
4. Step 4: Simplify right side
   73,693.50x = 30,005,688,062.25
5. Step 5: Solve for x
   x = 30,005,688,062.25/73,693.50
6. Step 6: Final answer
   x = 407,168.72