Finding the Third Proportional to 638,820 and 988,974

Step by Step Solution

1. Step 1: Write the proportion equation
   638,820 : 988,974 = 988,974 : x
2. Step 2: Convert to fraction form
   638,820/988,974 = 988,974/x
3. Step 3: Cross multiply
   638,820x = 988,974 × 988,974
4. Step 4: Simplify right side
   638,820x = 978,069,572,676
5. Step 5: Solve for x
   x = 978,069,572,676/638,820
6. Step 6: Final answer
   x = 1,531,056.59