Finding the Fourth Proportional to 21,580.82, 29,784.37 and 12,151.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,580.82 : 29,784.37 = 12,151.22 : x
2. Step 2: Convert to fraction form
   21,580.82/29,784.37 = 12,151.22/x
3. Step 3: Cross multiply
   21,580.82x = 29,784.37 × 12,151.22
4. Step 4: Simplify right side
   21,580.82x = 361,916,432.43
5. Step 5: Solve for x
   x = 361,916,432.43/21,580.82
6. Step 6: Final answer
   x = 16,770.28