Finding the Third Proportional to 400,078.50 and 619,072.50

Step by Step Solution

1. Step 1: Write the proportion equation
   400,078.50 : 619,072.50 = 619,072.50 : x
2. Step 2: Convert to fraction form
   400,078.50/619,072.50 = 619,072.50/x
3. Step 3: Cross multiply
   400,078.50x = 619,072.50 × 619,072.50
4. Step 4: Simplify right side
   400,078.50x = 383,250,760,256.25
5. Step 5: Solve for x
   x = 383,250,760,256.25/400,078.50
6. Step 6: Final answer
   x = 957,938.91