Finding the Third Proportional to 2,139.75 and 3,287.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.75 : 3,287.53 = 3,287.53 : x
2. Step 2: Convert to fraction form
   2,139.75/3,287.53 = 3,287.53/x
3. Step 3: Cross multiply
   2,139.75x = 3,287.53 × 3,287.53
4. Step 4: Simplify right side
   2,139.75x = 10,807,861.72
5. Step 5: Solve for x
   x = 10,807,861.72/2,139.75
6. Step 6: Final answer
   x = 5,050.99