Finding the Third Proportional to 639,818 and 1,400,164

Step by Step Solution

1. Step 1: Write the proportion equation
   639,818 : 1,400,164 = 1,400,164 : x
2. Step 2: Convert to fraction form
   639,818/1,400,164 = 1,400,164/x
3. Step 3: Cross multiply
   639,818x = 1,400,164 × 1,400,164
4. Step 4: Simplify right side
   639,818x = 1,960,459,226,896
5. Step 5: Solve for x
   x = 1,960,459,226,896/639,818
6. Step 6: Final answer
   x = 3,064,088.89