Finding the Third Proportional to 1,379.25 and 2,086.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.25 : 2,086.75 = 2,086.75 : x
2. Step 2: Convert to fraction form
   1,379.25/2,086.75 = 2,086.75/x
3. Step 3: Cross multiply
   1,379.25x = 2,086.75 × 2,086.75
4. Step 4: Simplify right side
   1,379.25x = 4,354,525.56
5. Step 5: Solve for x
   x = 4,354,525.56/1,379.25
6. Step 6: Final answer
   x = 3,157.17