Finding the Third Proportional to 143,978.50 and 198,471.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,978.50 : 198,471.50 = 198,471.50 : x
2. Step 2: Convert to fraction form
   143,978.50/198,471.50 = 198,471.50/x
3. Step 3: Cross multiply
   143,978.50x = 198,471.50 × 198,471.50
4. Step 4: Simplify right side
   143,978.50x = 39,390,936,312.25
5. Step 5: Solve for x
   x = 39,390,936,312.25/143,978.50
6. Step 6: Final answer
   x = 273,589.02