Finding the Third Proportional to 378,450 and 630,717.75

Step by Step Solution

1. Step 1: Write the proportion equation
   378,450 : 630,717.75 = 630,717.75 : x
2. Step 2: Convert to fraction form
   378,450/630,717.75 = 630,717.75/x
3. Step 3: Cross multiply
   378,450x = 630,717.75 × 630,717.75
4. Step 4: Simplify right side
   378,450x = 397,804,880,165.06
5. Step 5: Solve for x
   x = 397,804,880,165.06/378,450
6. Step 6: Final answer
   x = 1,051,142.50