Finding the Fourth Proportional to 21,081.50, 31,624.08 and 8,602.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,081.50 : 31,624.08 = 8,602.39 : x
2. Step 2: Convert to fraction form
   21,081.50/31,624.08 = 8,602.39/x
3. Step 3: Cross multiply
   21,081.50x = 31,624.08 × 8,602.39
4. Step 4: Simplify right side
   21,081.50x = 272,042,669.55
5. Step 5: Solve for x
   x = 272,042,669.55/21,081.50
6. Step 6: Final answer
   x = 12,904.33