Finding the Third Proportional to 217,066.50 and 335,440.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,066.50 : 335,440.50 = 335,440.50 : x
2. Step 2: Convert to fraction form
   217,066.50/335,440.50 = 335,440.50/x
3. Step 3: Cross multiply
   217,066.50x = 335,440.50 × 335,440.50
4. Step 4: Simplify right side
   217,066.50x = 112,520,329,040.25
5. Step 5: Solve for x
   x = 112,520,329,040.25/217,066.50
6. Step 6: Final answer
   x = 518,368.01