Finding the Third Proportional to 427,280 and 989,128

Step by Step Solution

1. Step 1: Write the proportion equation
   427,280 : 989,128 = 989,128 : x
2. Step 2: Convert to fraction form
   427,280/989,128 = 989,128/x
3. Step 3: Cross multiply
   427,280x = 989,128 × 989,128
4. Step 4: Simplify right side
   427,280x = 978,374,200,384
5. Step 5: Solve for x
   x = 978,374,200,384/427,280
6. Step 6: Final answer
   x = 2,289,772.98