Finding the Third Proportional to 18,391.50 and 39,699.75

Step by Step Solution

1. Step 1: Write the proportion equation
   18,391.50 : 39,699.75 = 39,699.75 : x
2. Step 2: Convert to fraction form
   18,391.50/39,699.75 = 39,699.75/x
3. Step 3: Cross multiply
   18,391.50x = 39,699.75 × 39,699.75
4. Step 4: Simplify right side
   18,391.50x = 1,576,070,150.06
5. Step 5: Solve for x
   x = 1,576,070,150.06/18,391.50
6. Step 6: Final answer
   x = 85,695.57