Finding the Third Proportional to 280,401.75 and 616,878

Step by Step Solution

1. Step 1: Write the proportion equation
   280,401.75 : 616,878 = 616,878 : x
2. Step 2: Convert to fraction form
   280,401.75/616,878 = 616,878/x
3. Step 3: Cross multiply
   280,401.75x = 616,878 × 616,878
4. Step 4: Simplify right side
   280,401.75x = 380,538,466,884
5. Step 5: Solve for x
   x = 380,538,466,884/280,401.75
6. Step 6: Final answer
   x = 1,357,118.73