Finding the Third Proportional to 668,410 and 1,391,898

Step by Step Solution

1. Step 1: Write the proportion equation
   668,410 : 1,391,898 = 1,391,898 : x
2. Step 2: Convert to fraction form
   668,410/1,391,898 = 1,391,898/x
3. Step 3: Cross multiply
   668,410x = 1,391,898 × 1,391,898
4. Step 4: Simplify right side
   668,410x = 1,937,380,042,404
5. Step 5: Solve for x
   x = 1,937,380,042,404/668,410
6. Step 6: Final answer
   x = 2,898,490.51