Finding the Third Proportional to 918,090 and 1,988,638

Step by Step Solution

1. Step 1: Write the proportion equation
   918,090 : 1,988,638 = 1,988,638 : x
2. Step 2: Convert to fraction form
   918,090/1,988,638 = 1,988,638/x
3. Step 3: Cross multiply
   918,090x = 1,988,638 × 1,988,638
4. Step 4: Simplify right side
   918,090x = 3,954,681,095,044
5. Step 5: Solve for x
   x = 3,954,681,095,044/918,090
6. Step 6: Final answer
   x = 4,307,509.17