Finding the Third Proportional to 143,289 and 219,631.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,289 : 219,631.50 = 219,631.50 : x
2. Step 2: Convert to fraction form
   143,289/219,631.50 = 219,631.50/x
3. Step 3: Cross multiply
   143,289x = 219,631.50 × 219,631.50
4. Step 4: Simplify right side
   143,289x = 48,237,995,792.25
5. Step 5: Solve for x
   x = 48,237,995,792.25/143,289
6. Step 6: Final answer
   x = 336,648.28