Finding the Fourth Proportional to 21,671.88, 32,504.94 and 8,520.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,671.88 : 32,504.94 = 8,520.72 : x
2. Step 2: Convert to fraction form
   21,671.88/32,504.94 = 8,520.72/x
3. Step 3: Cross multiply
   21,671.88x = 32,504.94 × 8,520.72
4. Step 4: Simplify right side
   21,671.88x = 276,965,492.36
5. Step 5: Solve for x
   x = 276,965,492.36/21,671.88
6. Step 6: Final answer
   x = 12,779.95