Finding the Third Proportional to 21,988 and 53,147

Step by Step Solution

1. Step 1: Write the proportion equation
   21,988 : 53,147 = 53,147 : x
2. Step 2: Convert to fraction form
   21,988/53,147 = 53,147/x
3. Step 3: Cross multiply
   21,988x = 53,147 × 53,147
4. Step 4: Simplify right side
   21,988x = 2,824,603,609
5. Step 5: Solve for x
   x = 2,824,603,609/21,988
6. Step 6: Final answer
   x = 128,461.14