Finding the Fourth Proportional to 21,151.33, 29,187.54 and 12,078.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,151.33 : 29,187.54 = 12,078.52 : x
2. Step 2: Convert to fraction form
   21,151.33/29,187.54 = 12,078.52/x
3. Step 3: Cross multiply
   21,151.33x = 29,187.54 × 12,078.52
4. Step 4: Simplify right side
   21,151.33x = 352,542,212.67
5. Step 5: Solve for x
   x = 352,542,212.67/21,151.33
6. Step 6: Final answer
   x = 16,667.62