Finding the Third Proportional to 638,845 and 1,407,315

Step by Step Solution

1. Step 1: Write the proportion equation
   638,845 : 1,407,315 = 1,407,315 : x
2. Step 2: Convert to fraction form
   638,845/1,407,315 = 1,407,315/x
3. Step 3: Cross multiply
   638,845x = 1,407,315 × 1,407,315
4. Step 4: Simplify right side
   638,845x = 1,980,535,509,225
5. Step 5: Solve for x
   x = 1,980,535,509,225/638,845
6. Step 6: Final answer
   x = 3,100,181.59