Finding the Third Proportional to 639,336 and 1,403,088

Step by Step Solution

1. Step 1: Write the proportion equation
   639,336 : 1,403,088 = 1,403,088 : x
2. Step 2: Convert to fraction form
   639,336/1,403,088 = 1,403,088/x
3. Step 3: Cross multiply
   639,336x = 1,403,088 × 1,403,088
4. Step 4: Simplify right side
   639,336x = 1,968,655,935,744
5. Step 5: Solve for x
   x = 1,968,655,935,744/639,336
6. Step 6: Final answer
   x = 3,079,219.59