Finding the Third Proportional to 143,356.50 and 215,011.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,356.50 : 215,011.50 = 215,011.50 : x
2. Step 2: Convert to fraction form
   143,356.50/215,011.50 = 215,011.50/x
3. Step 3: Cross multiply
   143,356.50x = 215,011.50 × 215,011.50
4. Step 4: Simplify right side
   143,356.50x = 46,229,945,132.25
5. Step 5: Solve for x
   x = 46,229,945,132.25/143,356.50
6. Step 6: Final answer
   x = 322,482.38