Finding the Third Proportional to 72,189.38 and 173,912.63

Step by Step Solution

1. Step 1: Write the proportion equation
   72,189.38 : 173,912.63 = 173,912.63 : x
2. Step 2: Convert to fraction form
   72,189.38/173,912.63 = 173,912.63/x
3. Step 3: Cross multiply
   72,189.38x = 173,912.63 × 173,912.63
4. Step 4: Simplify right side
   72,189.38x = 30,245,601,134.39
5. Step 5: Solve for x
   x = 30,245,601,134.39/72,189.38
6. Step 6: Final answer
   x = 418,975.80