Finding the Third Proportional to 17,985.50 and 39,540.50

Step by Step Solution

1. Step 1: Write the proportion equation
   17,985.50 : 39,540.50 = 39,540.50 : x
2. Step 2: Convert to fraction form
   17,985.50/39,540.50 = 39,540.50/x
3. Step 3: Cross multiply
   17,985.50x = 39,540.50 × 39,540.50
4. Step 4: Simplify right side
   17,985.50x = 1,563,451,140.25
5. Step 5: Solve for x
   x = 1,563,451,140.25/17,985.50
6. Step 6: Final answer
   x = 86,928.42