Finding the Third Proportional to 639,264 and 1,378,158

Step by Step Solution

1. Step 1: Write the proportion equation
   639,264 : 1,378,158 = 1,378,158 : x
2. Step 2: Convert to fraction form
   639,264/1,378,158 = 1,378,158/x
3. Step 3: Cross multiply
   639,264x = 1,378,158 × 1,378,158
4. Step 4: Simplify right side
   639,264x = 1,899,319,472,964
5. Step 5: Solve for x
   x = 1,899,319,472,964/639,264
6. Step 6: Final answer
   x = 2,971,103.45