Finding the Third Proportional to 390.94 and 849.38

Step by Step Solution

1. Step 1: Write the proportion equation
   390.94 : 849.38 = 849.38 : x
2. Step 2: Convert to fraction form
   390.94/849.38 = 849.38/x
3. Step 3: Cross multiply
   390.94x = 849.38 × 849.38
4. Step 4: Simplify right side
   390.94x = 721,437.89
5. Step 5: Solve for x
   x = 721,437.89/390.94
6. Step 6: Final answer
   x = 1,845.40