Finding the Third Proportional to 2,390.13 and 3,086.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.13 : 3,086.86 = 3,086.86 : x
2. Step 2: Convert to fraction form
   2,390.13/3,086.86 = 3,086.86/x
3. Step 3: Cross multiply
   2,390.13x = 3,086.86 × 3,086.86
4. Step 4: Simplify right side
   2,390.13x = 9,528,700.80
5. Step 5: Solve for x
   x = 9,528,700.80/2,390.13
6. Step 6: Final answer
   x = 3,986.68