Finding the Third Proportional to 129,779.50 and 287,741

Step by Step Solution

1. Step 1: Write the proportion equation
   129,779.50 : 287,741 = 287,741 : x
2. Step 2: Convert to fraction form
   129,779.50/287,741 = 287,741/x
3. Step 3: Cross multiply
   129,779.50x = 287,741 × 287,741
4. Step 4: Simplify right side
   129,779.50x = 82,794,883,081
5. Step 5: Solve for x
   x = 82,794,883,081/129,779.50
6. Step 6: Final answer
   x = 637,965.80