Finding the Third Proportional to 639,156 and 1,368,088

Step by Step Solution

1. Step 1: Write the proportion equation
   639,156 : 1,368,088 = 1,368,088 : x
2. Step 2: Convert to fraction form
   639,156/1,368,088 = 1,368,088/x
3. Step 3: Cross multiply
   639,156x = 1,368,088 × 1,368,088
4. Step 4: Simplify right side
   639,156x = 1,871,664,775,744
5. Step 5: Solve for x
   x = 1,871,664,775,744/639,156
6. Step 6: Final answer
   x = 2,928,337.96