Finding the Third Proportional to 15,121.50 and 17,308.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,121.50 : 17,308.50 = 17,308.50 : x
2. Step 2: Convert to fraction form
   15,121.50/17,308.50 = 17,308.50/x
3. Step 3: Cross multiply
   15,121.50x = 17,308.50 × 17,308.50
4. Step 4: Simplify right side
   15,121.50x = 299,584,172.25
5. Step 5: Solve for x
   x = 299,584,172.25/15,121.50
6. Step 6: Final answer
   x = 19,811.80