Finding the Third Proportional to 309,780.50 and 677,881

Step by Step Solution

1. Step 1: Write the proportion equation
   309,780.50 : 677,881 = 677,881 : x
2. Step 2: Convert to fraction form
   309,780.50/677,881 = 677,881/x
3. Step 3: Cross multiply
   309,780.50x = 677,881 × 677,881
4. Step 4: Simplify right side
   309,780.50x = 459,522,650,161
5. Step 5: Solve for x
   x = 459,522,650,161/309,780.50
6. Step 6: Final answer
   x = 1,483,381.46