Finding the Fourth Proportional to 21,238.76, 29,223.78 and 20,696.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,238.76 : 29,223.78 = 20,696.04 : x
2. Step 2: Convert to fraction form
   21,238.76/29,223.78 = 20,696.04/x
3. Step 3: Cross multiply
   21,238.76x = 29,223.78 × 20,696.04
4. Step 4: Simplify right side
   21,238.76x = 604,816,519.83
5. Step 5: Solve for x
   x = 604,816,519.83/21,238.76
6. Step 6: Final answer
   x = 28,477.02