Finding the Third Proportional to 13,218.75 and 14,143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,218.75 : 14,143.50 = 14,143.50 : x
2. Step 2: Convert to fraction form
   13,218.75/14,143.50 = 14,143.50/x
3. Step 3: Cross multiply
   13,218.75x = 14,143.50 × 14,143.50
4. Step 4: Simplify right side
   13,218.75x = 200,038,592.25
5. Step 5: Solve for x
   x = 200,038,592.25/13,218.75
6. Step 6: Final answer
   x = 15,132.94