Finding the Third Proportional to 2,155,390 and 3,138,315

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155,390 : 3,138,315 = 3,138,315 : x
2. Step 2: Convert to fraction form
   2,155,390/3,138,315 = 3,138,315/x
3. Step 3: Cross multiply
   2,155,390x = 3,138,315 × 3,138,315
4. Step 4: Simplify right side
   2,155,390x = 9,849,021,039,225
5. Step 5: Solve for x
   x = 9,849,021,039,225/2,155,390
6. Step 6: Final answer
   x = 4,569,484.43