Finding the Fourth Proportional to 21,456.46, 32,191.31 and 9,620.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,456.46 : 32,191.31 = 9,620.20 : x
2. Step 2: Convert to fraction form
   21,456.46/32,191.31 = 9,620.20/x
3. Step 3: Cross multiply
   21,456.46x = 32,191.31 × 9,620.20
4. Step 4: Simplify right side
   21,456.46x = 309,686,840.46
5. Step 5: Solve for x
   x = 309,686,840.46/21,456.46
6. Step 6: Final answer
   x = 14,433.27