Finding the Third Proportional to 85,120 and 172,672

Step by Step Solution

1. Step 1: Write the proportion equation
   85,120 : 172,672 = 172,672 : x
2. Step 2: Convert to fraction form
   85,120/172,672 = 172,672/x
3. Step 3: Cross multiply
   85,120x = 172,672 × 172,672
4. Step 4: Simplify right side
   85,120x = 29,815,619,584
5. Step 5: Solve for x
   x = 29,815,619,584/85,120
6. Step 6: Final answer
   x = 350,277.49