Finding the Third Proportional to 820.41 and 1,405.69

Step by Step Solution

1. Step 1: Write the proportion equation
   820.41 : 1,405.69 = 1,405.69 : x
2. Step 2: Convert to fraction form
   820.41/1,405.69 = 1,405.69/x
3. Step 3: Cross multiply
   820.41x = 1,405.69 × 1,405.69
4. Step 4: Simplify right side
   820.41x = 1,975,957.35
5. Step 5: Solve for x
   x = 1,975,957.35/820.41
6. Step 6: Final answer
   x = 2,408.51