Finding the Third Proportional to 518,400 and 777,600.50

Step by Step Solution

1. Step 1: Write the proportion equation
   518,400 : 777,600.50 = 777,600.50 : x
2. Step 2: Convert to fraction form
   518,400/777,600.50 = 777,600.50/x
3. Step 3: Cross multiply
   518,400x = 777,600.50 × 777,600.50
4. Step 4: Simplify right side
   518,400x = 604,662,537,600.25
5. Step 5: Solve for x
   x = 604,662,537,600.25/518,400
6. Step 6: Final answer
   x = 1,166,401.50