Finding the Third Proportional to 639,770 and 1,368,108

Step by Step Solution

1. Step 1: Write the proportion equation
   639,770 : 1,368,108 = 1,368,108 : x
2. Step 2: Convert to fraction form
   639,770/1,368,108 = 1,368,108/x
3. Step 3: Cross multiply
   639,770x = 1,368,108 × 1,368,108
4. Step 4: Simplify right side
   639,770x = 1,871,719,499,664
5. Step 5: Solve for x
   x = 1,871,719,499,664/639,770
6. Step 6: Final answer
   x = 2,925,613.11