Finding the Third Proportional to 18,663.75 and 28,291.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,663.75 : 28,291.50 = 28,291.50 : x
2. Step 2: Convert to fraction form
   18,663.75/28,291.50 = 28,291.50/x
3. Step 3: Cross multiply
   18,663.75x = 28,291.50 × 28,291.50
4. Step 4: Simplify right side
   18,663.75x = 800,408,972.25
5. Step 5: Solve for x
   x = 800,408,972.25/18,663.75
6. Step 6: Final answer
   x = 42,885.75