Finding the Third Proportional to 8,422.50 and 17,989.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,422.50 : 17,989.50 = 17,989.50 : x
2. Step 2: Convert to fraction form
   8,422.50/17,989.50 = 17,989.50/x
3. Step 3: Cross multiply
   8,422.50x = 17,989.50 × 17,989.50
4. Step 4: Simplify right side
   8,422.50x = 323,622,110.25
5. Step 5: Solve for x
   x = 323,622,110.25/8,422.50
6. Step 6: Final answer
   x = 38,423.52