Finding the Third Proportional to 668,418 and 1,391,916

Step by Step Solution

1. Step 1: Write the proportion equation
   668,418 : 1,391,916 = 1,391,916 : x
2. Step 2: Convert to fraction form
   668,418/1,391,916 = 1,391,916/x
3. Step 3: Cross multiply
   668,418x = 1,391,916 × 1,391,916
4. Step 4: Simplify right side
   668,418x = 1,937,430,151,056
5. Step 5: Solve for x
   x = 1,937,430,151,056/668,418
6. Step 6: Final answer
   x = 2,898,530.79