Finding the Third Proportional to 217,679 and 336,355.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,679 : 336,355.50 = 336,355.50 : x
2. Step 2: Convert to fraction form
   217,679/336,355.50 = 336,355.50/x
3. Step 3: Cross multiply
   217,679x = 336,355.50 × 336,355.50
4. Step 4: Simplify right side
   217,679x = 113,135,022,380.25
5. Step 5: Solve for x
   x = 113,135,022,380.25/217,679
6. Step 6: Final answer
   x = 519,733.29