Finding the Fourth Proportional to 21,404.20, 32,266.72 and 19,977

Step by Step Solution

1. Step 1: Write the proportion equation
   21,404.20 : 32,266.72 = 19,977 : x
2. Step 2: Convert to fraction form
   21,404.20/32,266.72 = 19,977/x
3. Step 3: Cross multiply
   21,404.20x = 32,266.72 × 19,977
4. Step 4: Simplify right side
   21,404.20x = 644,592,265.44
5. Step 5: Solve for x
   x = 644,592,265.44/21,404.20
6. Step 6: Final answer
   x = 30,115.22