Finding the Third Proportional to 9,988.50 and 14,388.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,988.50 : 14,388.50 = 14,388.50 : x
2. Step 2: Convert to fraction form
   9,988.50/14,388.50 = 14,388.50/x
3. Step 3: Cross multiply
   9,988.50x = 14,388.50 × 14,388.50
4. Step 4: Simplify right side
   9,988.50x = 207,028,932.25
5. Step 5: Solve for x
   x = 207,028,932.25/9,988.50
6. Step 6: Final answer
   x = 20,726.73