Finding the Third Proportional to 15,200 and 21,988

Step by Step Solution

1. Step 1: Write the proportion equation
   15,200 : 21,988 = 21,988 : x
2. Step 2: Convert to fraction form
   15,200/21,988 = 21,988/x
3. Step 3: Cross multiply
   15,200x = 21,988 × 21,988
4. Step 4: Simplify right side
   15,200x = 483,472,144
5. Step 5: Solve for x
   x = 483,472,144/15,200
6. Step 6: Final answer
   x = 31,807.38