Finding the Third Proportional to 2,785.50 and 3,990.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,785.50 : 3,990.38 = 3,990.38 : x
2. Step 2: Convert to fraction form
   2,785.50/3,990.38 = 3,990.38/x
3. Step 3: Cross multiply
   2,785.50x = 3,990.38 × 3,990.38
4. Step 4: Simplify right side
   2,785.50x = 15,923,092.64
5. Step 5: Solve for x
   x = 15,923,092.64/2,785.50
6. Step 6: Final answer
   x = 5,716.42