Finding the Third Proportional to 190,568.50 and 280,143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   190,568.50 : 280,143.50 = 280,143.50 : x
2. Step 2: Convert to fraction form
   190,568.50/280,143.50 = 280,143.50/x
3. Step 3: Cross multiply
   190,568.50x = 280,143.50 × 280,143.50
4. Step 4: Simplify right side
   190,568.50x = 78,480,380,592.25
5. Step 5: Solve for x
   x = 78,480,380,592.25/190,568.50
6. Step 6: Final answer
   x = 411,822.42