Finding the Third Proportional to 639,778 and 1,358,276

Step by Step Solution

1. Step 1: Write the proportion equation
   639,778 : 1,358,276 = 1,358,276 : x
2. Step 2: Convert to fraction form
   639,778/1,358,276 = 1,358,276/x
3. Step 3: Cross multiply
   639,778x = 1,358,276 × 1,358,276
4. Step 4: Simplify right side
   639,778x = 1,844,913,692,176
5. Step 5: Solve for x
   x = 1,844,913,692,176/639,778
6. Step 6: Final answer
   x = 2,883,677.92