Finding the Third Proportional to 1,408,278 and 2,119,140

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408,278 : 2,119,140 = 2,119,140 : x
2. Step 2: Convert to fraction form
   1,408,278/2,119,140 = 2,119,140/x
3. Step 3: Cross multiply
   1,408,278x = 2,119,140 × 2,119,140
4. Step 4: Simplify right side
   1,408,278x = 4,490,754,339,600
5. Step 5: Solve for x
   x = 4,490,754,339,600/1,408,278
6. Step 6: Final answer
   x = 3,188,826.60