Finding the Third Proportional to 131,419.50 and 287,715

Step by Step Solution

1. Step 1: Write the proportion equation
   131,419.50 : 287,715 = 287,715 : x
2. Step 2: Convert to fraction form
   131,419.50/287,715 = 287,715/x
3. Step 3: Cross multiply
   131,419.50x = 287,715 × 287,715
4. Step 4: Simplify right side
   131,419.50x = 82,779,921,225
5. Step 5: Solve for x
   x = 82,779,921,225/131,419.50
6. Step 6: Final answer
   x = 629,890.70