Finding the Fourth Proportional to 21,587.42, 29,790.50 and 12,159.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,587.42 : 29,790.50 = 12,159.02 : x
2. Step 2: Convert to fraction form
   21,587.42/29,790.50 = 12,159.02/x
3. Step 3: Cross multiply
   21,587.42x = 29,790.50 × 12,159.02
4. Step 4: Simplify right side
   21,587.42x = 362,223,285.31
5. Step 5: Solve for x
   x = 362,223,285.31/21,587.42
6. Step 6: Final answer
   x = 16,779.37