Finding the Third Proportional to 391.94 and 899.56

Step by Step Solution

1. Step 1: Write the proportion equation
   391.94 : 899.56 = 899.56 : x
2. Step 2: Convert to fraction form
   391.94/899.56 = 899.56/x
3. Step 3: Cross multiply
   391.94x = 899.56 × 899.56
4. Step 4: Simplify right side
   391.94x = 809,212.69
5. Step 5: Solve for x
   x = 809,212.69/391.94
6. Step 6: Final answer
   x = 2,064.65