Finding the Fourth Proportional to 21,581.07, 29,784.72 and 12,151.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,581.07 : 29,784.72 = 12,151.47 : x
2. Step 2: Convert to fraction form
   21,581.07/29,784.72 = 12,151.47/x
3. Step 3: Cross multiply
   21,581.07x = 29,784.72 × 12,151.47
4. Step 4: Simplify right side
   21,581.07x = 361,928,131.54
5. Step 5: Solve for x
   x = 361,928,131.54/21,581.07
6. Step 6: Final answer
   x = 16,770.63