Finding the Third Proportional to 172,287 and 359,316

Step by Step Solution

1. Step 1: Write the proportion equation
   172,287 : 359,316 = 359,316 : x
2. Step 2: Convert to fraction form
   172,287/359,316 = 359,316/x
3. Step 3: Cross multiply
   172,287x = 359,316 × 359,316
4. Step 4: Simplify right side
   172,287x = 129,107,987,856
5. Step 5: Solve for x
   x = 129,107,987,856/172,287
6. Step 6: Final answer
   x = 749,377.42