Finding the Fourth Proportional to 21,164.20, 29,196.78 and 14,880.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,164.20 : 29,196.78 = 14,880.28 : x
2. Step 2: Convert to fraction form
   21,164.20/29,196.78 = 14,880.28/x
3. Step 3: Cross multiply
   21,164.20x = 29,196.78 × 14,880.28
4. Step 4: Simplify right side
   21,164.20x = 434,456,261.50
5. Step 5: Solve for x
   x = 434,456,261.50/21,164.20
6. Step 6: Final answer
   x = 20,527.88