Finding the Third Proportional to 1,391,691 and 2,154,872

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391,691 : 2,154,872 = 2,154,872 : x
2. Step 2: Convert to fraction form
   1,391,691/2,154,872 = 2,154,872/x
3. Step 3: Cross multiply
   1,391,691x = 2,154,872 × 2,154,872
4. Step 4: Simplify right side
   1,391,691x = 4,643,473,336,384
5. Step 5: Solve for x
   x = 4,643,473,336,384/1,391,691
6. Step 6: Final answer
   x = 3,336,569.21