Finding the Third Proportional to 217,783 and 336,475.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,783 : 336,475.50 = 336,475.50 : x
2. Step 2: Convert to fraction form
   217,783/336,475.50 = 336,475.50/x
3. Step 3: Cross multiply
   217,783x = 336,475.50 × 336,475.50
4. Step 4: Simplify right side
   217,783x = 113,215,762,100.25
5. Step 5: Solve for x
   x = 113,215,762,100.25/217,783
6. Step 6: Final answer
   x = 519,855.83