Finding the Third Proportional to 15,157.50 and 18,256.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,157.50 : 18,256.50 = 18,256.50 : x
2. Step 2: Convert to fraction form
   15,157.50/18,256.50 = 18,256.50/x
3. Step 3: Cross multiply
   15,157.50x = 18,256.50 × 18,256.50
4. Step 4: Simplify right side
   15,157.50x = 333,299,792.25
5. Step 5: Solve for x
   x = 333,299,792.25/15,157.50
6. Step 6: Final answer
   x = 21,989.10