Finding the Third Proportional to 131,720 and 287,632

Step by Step Solution

1. Step 1: Write the proportion equation
   131,720 : 287,632 = 287,632 : x
2. Step 2: Convert to fraction form
   131,720/287,632 = 287,632/x
3. Step 3: Cross multiply
   131,720x = 287,632 × 287,632
4. Step 4: Simplify right side
   131,720x = 82,732,167,424
5. Step 5: Solve for x
   x = 82,732,167,424/131,720
6. Step 6: Final answer
   x = 628,091.16