Finding the Third Proportional to 861.50 and 1,840

Step by Step Solution

1. Step 1: Write the proportion equation
   861.50 : 1,840 = 1,840 : x
2. Step 2: Convert to fraction form
   861.50/1,840 = 1,840/x
3. Step 3: Cross multiply
   861.50x = 1,840 × 1,840
4. Step 4: Simplify right side
   861.50x = 3,385,600
5. Step 5: Solve for x
   x = 3,385,600/861.50
6. Step 6: Final answer
   x = 3,929.89