Finding the Third Proportional to 18,378 and 39,811.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,378 : 39,811.50 = 39,811.50 : x
2. Step 2: Convert to fraction form
   18,378/39,811.50 = 39,811.50/x
3. Step 3: Cross multiply
   18,378x = 39,811.50 × 39,811.50
4. Step 4: Simplify right side
   18,378x = 1,584,955,532.25
5. Step 5: Solve for x
   x = 1,584,955,532.25/18,378
6. Step 6: Final answer
   x = 86,242.00