Finding the Third Proportional to 381,679.50 and 518,360

Step by Step Solution

1. Step 1: Write the proportion equation
   381,679.50 : 518,360 = 518,360 : x
2. Step 2: Convert to fraction form
   381,679.50/518,360 = 518,360/x
3. Step 3: Cross multiply
   381,679.50x = 518,360 × 518,360
4. Step 4: Simplify right side
   381,679.50x = 268,697,089,600
5. Step 5: Solve for x
   x = 268,697,089,600/381,679.50
6. Step 6: Final answer
   x = 703,986.17