Finding the Third Proportional to 639,140.50 and 1,368,059.50

Step by Step Solution

1. Step 1: Write the proportion equation
   639,140.50 : 1,368,059.50 = 1,368,059.50 : x
2. Step 2: Convert to fraction form
   639,140.50/1,368,059.50 = 1,368,059.50/x
3. Step 3: Cross multiply
   639,140.50x = 1,368,059.50 × 1,368,059.50
4. Step 4: Simplify right side
   639,140.50x = 1,871,586,795,540.25
5. Step 5: Solve for x
   x = 1,871,586,795,540.25/639,140.50
6. Step 6: Final answer
   x = 2,928,286.97