Finding the Third Proportional to 172,910 and 357,820

Step by Step Solution

1. Step 1: Write the proportion equation
   172,910 : 357,820 = 357,820 : x
2. Step 2: Convert to fraction form
   172,910/357,820 = 357,820/x
3. Step 3: Cross multiply
   172,910x = 357,820 × 357,820
4. Step 4: Simplify right side
   172,910x = 128,035,152,400
5. Step 5: Solve for x
   x = 128,035,152,400/172,910
6. Step 6: Final answer
   x = 740,472.80