Finding the Third Proportional to 143,899 and 217,855.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,899 : 217,855.50 = 217,855.50 : x
2. Step 2: Convert to fraction form
   143,899/217,855.50 = 217,855.50/x
3. Step 3: Cross multiply
   143,899x = 217,855.50 × 217,855.50
4. Step 4: Simplify right side
   143,899x = 47,461,018,880.25
5. Step 5: Solve for x
   x = 47,461,018,880.25/143,899
6. Step 6: Final answer
   x = 329,821.74