Finding the Fourth Proportional to 21,618.79, 29,833.88 and 12,058.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,618.79 : 29,833.88 = 12,058.69 : x
2. Step 2: Convert to fraction form
   21,618.79/29,833.88 = 12,058.69/x
3. Step 3: Cross multiply
   21,618.79x = 29,833.88 × 12,058.69
4. Step 4: Simplify right side
   21,618.79x = 359,757,300.95
5. Step 5: Solve for x
   x = 359,757,300.95/21,618.79
6. Step 6: Final answer
   x = 16,640.96