Finding the Third Proportional to 668,407 and 1,391,892

Step by Step Solution

1. Step 1: Write the proportion equation
   668,407 : 1,391,892 = 1,391,892 : x
2. Step 2: Convert to fraction form
   668,407/1,391,892 = 1,391,892/x
3. Step 3: Cross multiply
   668,407x = 1,391,892 × 1,391,892
4. Step 4: Simplify right side
   668,407x = 1,937,363,339,664
5. Step 5: Solve for x
   x = 1,937,363,339,664/668,407
6. Step 6: Final answer
   x = 2,898,478.53