Finding the Third Proportional to 8,700 and 13,171.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,700 : 13,171.50 = 13,171.50 : x
2. Step 2: Convert to fraction form
   8,700/13,171.50 = 13,171.50/x
3. Step 3: Cross multiply
   8,700x = 13,171.50 × 13,171.50
4. Step 4: Simplify right side
   8,700x = 173,488,412.25
5. Step 5: Solve for x
   x = 173,488,412.25/8,700
6. Step 6: Final answer
   x = 19,941.20