Finding the Third Proportional to 2,142.50 and 3,198.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.50 : 3,198.50 = 3,198.50 : x
2. Step 2: Convert to fraction form
   2,142.50/3,198.50 = 3,198.50/x
3. Step 3: Cross multiply
   2,142.50x = 3,198.50 × 3,198.50
4. Step 4: Simplify right side
   2,142.50x = 10,230,402.25
5. Step 5: Solve for x
   x = 10,230,402.25/2,142.50
6. Step 6: Final answer
   x = 4,774.98