Finding the Third Proportional to 345,600.50 and 518,401

Step by Step Solution

1. Step 1: Write the proportion equation
   345,600.50 : 518,401 = 518,401 : x
2. Step 2: Convert to fraction form
   345,600.50/518,401 = 518,401/x
3. Step 3: Cross multiply
   345,600.50x = 518,401 × 518,401
4. Step 4: Simplify right side
   345,600.50x = 268,739,596,801
5. Step 5: Solve for x
   x = 268,739,596,801/345,600.50
6. Step 6: Final answer
   x = 777,601.88