Finding the Third Proportional to 878,720 and 1,917,818

Step by Step Solution

1. Step 1: Write the proportion equation
   878,720 : 1,917,818 = 1,917,818 : x
2. Step 2: Convert to fraction form
   878,720/1,917,818 = 1,917,818/x
3. Step 3: Cross multiply
   878,720x = 1,917,818 × 1,917,818
4. Step 4: Simplify right side
   878,720x = 3,678,025,881,124
5. Step 5: Solve for x
   x = 3,678,025,881,124/878,720
6. Step 6: Final answer
   x = 4,185,663.10