Finding the Third Proportional to 18,378.38 and 39,868.88

Step by Step Solution

1. Step 1: Write the proportion equation
   18,378.38 : 39,868.88 = 39,868.88 : x
2. Step 2: Convert to fraction form
   18,378.38/39,868.88 = 39,868.88/x
3. Step 3: Cross multiply
   18,378.38x = 39,868.88 × 39,868.88
4. Step 4: Simplify right side
   18,378.38x = 1,589,527,193.77
5. Step 5: Solve for x
   x = 1,589,527,193.77/18,378.38
6. Step 6: Final answer
   x = 86,489.00