Finding the Third Proportional to 390.45 and 835.52

Step by Step Solution

1. Step 1: Write the proportion equation
   390.45 : 835.52 = 835.52 : x
2. Step 2: Convert to fraction form
   390.45/835.52 = 835.52/x
3. Step 3: Cross multiply
   390.45x = 835.52 × 835.52
4. Step 4: Simplify right side
   390.45x = 698,099.41
5. Step 5: Solve for x
   x = 698,099.41/390.45
6. Step 6: Final answer
   x = 1,787.96