Finding the Third Proportional to 131,648.50 and 289,039

Step by Step Solution

1. Step 1: Write the proportion equation
   131,648.50 : 289,039 = 289,039 : x
2. Step 2: Convert to fraction form
   131,648.50/289,039 = 289,039/x
3. Step 3: Cross multiply
   131,648.50x = 289,039 × 289,039
4. Step 4: Simplify right side
   131,648.50x = 83,543,543,521
5. Step 5: Solve for x
   x = 83,543,543,521/131,648.50
6. Step 6: Final answer
   x = 634,595.48