Finding the Third Proportional to 436,819.50 and 678,557.25

Step by Step Solution

1. Step 1: Write the proportion equation
   436,819.50 : 678,557.25 = 678,557.25 : x
2. Step 2: Convert to fraction form
   436,819.50/678,557.25 = 678,557.25/x
3. Step 3: Cross multiply
   436,819.50x = 678,557.25 × 678,557.25
4. Step 4: Simplify right side
   436,819.50x = 460,439,941,527.56
5. Step 5: Solve for x
   x = 460,439,941,527.56/436,819.50
6. Step 6: Final answer
   x = 1,054,073.69