Finding the Third Proportional to 152,720 and 328,040

Step by Step Solution

1. Step 1: Write the proportion equation
   152,720 : 328,040 = 328,040 : x
2. Step 2: Convert to fraction form
   152,720/328,040 = 328,040/x
3. Step 3: Cross multiply
   152,720x = 328,040 × 328,040
4. Step 4: Simplify right side
   152,720x = 107,610,241,600
5. Step 5: Solve for x
   x = 107,610,241,600/152,720
6. Step 6: Final answer
   x = 704,624.42