Finding the Third Proportional to 817,890 and 1,787,412

Step by Step Solution

1. Step 1: Write the proportion equation
   817,890 : 1,787,412 = 1,787,412 : x
2. Step 2: Convert to fraction form
   817,890/1,787,412 = 1,787,412/x
3. Step 3: Cross multiply
   817,890x = 1,787,412 × 1,787,412
4. Step 4: Simplify right side
   817,890x = 3,194,841,657,744
5. Step 5: Solve for x
   x = 3,194,841,657,744/817,890
6. Step 6: Final answer
   x = 3,906,199.68