Finding the Third Proportional to 986,391 and 2,155,410

Step by Step Solution

1. Step 1: Write the proportion equation
   986,391 : 2,155,410 = 2,155,410 : x
2. Step 2: Convert to fraction form
   986,391/2,155,410 = 2,155,410/x
3. Step 3: Cross multiply
   986,391x = 2,155,410 × 2,155,410
4. Step 4: Simplify right side
   986,391x = 4,645,792,268,100
5. Step 5: Solve for x
   x = 4,645,792,268,100/986,391
6. Step 6: Final answer
   x = 4,709,889.15