Finding the Third Proportional to 805.78 and 1,668.52

Step by Step Solution

1. Step 1: Write the proportion equation
   805.78 : 1,668.52 = 1,668.52 : x
2. Step 2: Convert to fraction form
   805.78/1,668.52 = 1,668.52/x
3. Step 3: Cross multiply
   805.78x = 1,668.52 × 1,668.52
4. Step 4: Simplify right side
   805.78x = 2,783,944.39
5. Step 5: Solve for x
   x = 2,783,944.39/805.78
6. Step 6: Final answer
   x = 3,454.96