Finding the Third Proportional to 72,279.21 and 173,912.06

Step by Step Solution

1. Step 1: Write the proportion equation
   72,279.21 : 173,912.06 = 173,912.06 : x
2. Step 2: Convert to fraction form
   72,279.21/173,912.06 = 173,912.06/x
3. Step 3: Cross multiply
   72,279.21x = 173,912.06 × 173,912.06
4. Step 4: Simplify right side
   72,279.21x = 30,245,405,483.00
5. Step 5: Solve for x
   x = 30,245,405,483.00/72,279.21
6. Step 6: Final answer
   x = 418,452.35