Finding the Third Proportional to 21,786.47 and 30,678.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,786.47 : 30,678.75 = 30,678.75 : x
2. Step 2: Convert to fraction form
   21,786.47/30,678.75 = 30,678.75/x
3. Step 3: Cross multiply
   21,786.47x = 30,678.75 × 30,678.75
4. Step 4: Simplify right side
   21,786.47x = 941,185,701.56
5. Step 5: Solve for x
   x = 941,185,701.56/21,786.47
6. Step 6: Final answer
   x = 43,200.47