Finding the Fourth Proportional to 21,103.27, 29,255.70 and 19,979.70

Step by Step Solution

1. Step 1: Write the proportion equation
   21,103.27 : 29,255.70 = 19,979.70 : x
2. Step 2: Convert to fraction form
   21,103.27/29,255.70 = 19,979.70/x
3. Step 3: Cross multiply
   21,103.27x = 29,255.70 × 19,979.70
4. Step 4: Simplify right side
   21,103.27x = 584,520,109.29
5. Step 5: Solve for x
   x = 584,520,109.29/21,103.27
6. Step 6: Final answer
   x = 27,698.08