Finding the Third Proportional to 18,661.50 and 40,387.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,661.50 : 40,387.50 = 40,387.50 : x
2. Step 2: Convert to fraction form
   18,661.50/40,387.50 = 40,387.50/x
3. Step 3: Cross multiply
   18,661.50x = 40,387.50 × 40,387.50
4. Step 4: Simplify right side
   18,661.50x = 1,631,150,156.25
5. Step 5: Solve for x
   x = 1,631,150,156.25/18,661.50
6. Step 6: Final answer
   x = 87,407.24