Finding the Third Proportional to 399,294 and 603,099.75

Step by Step Solution

1. Step 1: Write the proportion equation
   399,294 : 603,099.75 = 603,099.75 : x
2. Step 2: Convert to fraction form
   399,294/603,099.75 = 603,099.75/x
3. Step 3: Cross multiply
   399,294x = 603,099.75 × 603,099.75
4. Step 4: Simplify right side
   399,294x = 363,729,308,450.06
5. Step 5: Solve for x
   x = 363,729,308,450.06/399,294
6. Step 6: Final answer
   x = 910,931.06