Finding the Fourth Proportional to 21,581.12, 32,380.56 and 8,442.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,581.12 : 32,380.56 = 8,442.72 : x
2. Step 2: Convert to fraction form
   21,581.12/32,380.56 = 8,442.72/x
3. Step 3: Cross multiply
   21,581.12x = 32,380.56 × 8,442.72
4. Step 4: Simplify right side
   21,581.12x = 273,380,001.52
5. Step 5: Solve for x
   x = 273,380,001.52/21,581.12
6. Step 6: Final answer
   x = 12,667.55