Finding the Third Proportional to 72,205.17 and 168,706.55

Step by Step Solution

1. Step 1: Write the proportion equation
   72,205.17 : 168,706.55 = 168,706.55 : x
2. Step 2: Convert to fraction form
   72,205.17/168,706.55 = 168,706.55/x
3. Step 3: Cross multiply
   72,205.17x = 168,706.55 × 168,706.55
4. Step 4: Simplify right side
   72,205.17x = 28,461,898,958.49
5. Step 5: Solve for x
   x = 28,461,898,958.49/72,205.17
6. Step 6: Final answer
   x = 394,180.89