Finding the Fourth Proportional to 21,522.72, 32,072.80 and 20,818.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,522.72 : 32,072.80 = 20,818.04 : x
2. Step 2: Convert to fraction form
   21,522.72/32,072.80 = 20,818.04/x
3. Step 3: Cross multiply
   21,522.72x = 32,072.80 × 20,818.04
4. Step 4: Simplify right side
   21,522.72x = 667,692,833.31
5. Step 5: Solve for x
   x = 667,692,833.31/21,522.72
6. Step 6: Final answer
   x = 31,022.70