Finding the Third Proportional to 865.50 and 1,860

Step by Step Solution

1. Step 1: Write the proportion equation
   865.50 : 1,860 = 1,860 : x
2. Step 2: Convert to fraction form
   865.50/1,860 = 1,860/x
3. Step 3: Cross multiply
   865.50x = 1,860 × 1,860
4. Step 4: Simplify right side
   865.50x = 3,459,600
5. Step 5: Solve for x
   x = 3,459,600/865.50
6. Step 6: Final answer
   x = 3,997.23