Finding the Fourth Proportional to 21,603.96, 32,404.85 and 8,458.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,603.96 : 32,404.85 = 8,458.74 : x
2. Step 2: Convert to fraction form
   21,603.96/32,404.85 = 8,458.74/x
3. Step 3: Cross multiply
   21,603.96x = 32,404.85 × 8,458.74
4. Step 4: Simplify right side
   21,603.96x = 274,104,200.89
5. Step 5: Solve for x
   x = 274,104,200.89/21,603.96
6. Step 6: Final answer
   x = 12,687.68