Finding the Third Proportional to 393.61 and 854.61

Step by Step Solution

1. Step 1: Write the proportion equation
   393.61 : 854.61 = 854.61 : x
2. Step 2: Convert to fraction form
   393.61/854.61 = 854.61/x
3. Step 3: Cross multiply
   393.61x = 854.61 × 854.61
4. Step 4: Simplify right side
   393.61x = 730,363.86
5. Step 5: Solve for x
   x = 730,363.86/393.61
6. Step 6: Final answer
   x = 1,855.56