Finding the Third Proportional to 335,037.50 and 518,109

Step by Step Solution

1. Step 1: Write the proportion equation
   335,037.50 : 518,109 = 518,109 : x
2. Step 2: Convert to fraction form
   335,037.50/518,109 = 518,109/x
3. Step 3: Cross multiply
   335,037.50x = 518,109 × 518,109
4. Step 4: Simplify right side
   335,037.50x = 268,436,935,881
5. Step 5: Solve for x
   x = 268,436,935,881/335,037.50
6. Step 6: Final answer
   x = 801,214.60