Finding the Third Proportional to 639,964 and 1,374,900

Step by Step Solution

1. Step 1: Write the proportion equation
   639,964 : 1,374,900 = 1,374,900 : x
2. Step 2: Convert to fraction form
   639,964/1,374,900 = 1,374,900/x
3. Step 3: Cross multiply
   639,964x = 1,374,900 × 1,374,900
4. Step 4: Simplify right side
   639,964x = 1,890,350,010,000
5. Step 5: Solve for x
   x = 1,890,350,010,000/639,964
6. Step 6: Final answer
   x = 2,953,838.04