Finding the Fourth Proportional to 21,976.98, 30,378.06 and 20,233.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,976.98 : 30,378.06 = 20,233.20 : x
2. Step 2: Convert to fraction form
   21,976.98/30,378.06 = 20,233.20/x
3. Step 3: Cross multiply
   21,976.98x = 30,378.06 × 20,233.20
4. Step 4: Simplify right side
   21,976.98x = 614,645,363.59
5. Step 5: Solve for x
   x = 614,645,363.59/21,976.98
6. Step 6: Final answer
   x = 27,967.69