Finding the Third Proportional to 639,700 and 1,358,131

Step by Step Solution

1. Step 1: Write the proportion equation
   639,700 : 1,358,131 = 1,358,131 : x
2. Step 2: Convert to fraction form
   639,700/1,358,131 = 1,358,131/x
3. Step 3: Cross multiply
   639,700x = 1,358,131 × 1,358,131
4. Step 4: Simplify right side
   639,700x = 1,844,519,813,161
5. Step 5: Solve for x
   x = 1,844,519,813,161/639,700
6. Step 6: Final answer
   x = 2,883,413.81