Finding the Fourth Proportional to 21,585.60, 29,789.29 and 12,155.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,585.60 : 29,789.29 = 12,155.04 : x
2. Step 2: Convert to fraction form
   21,585.60/29,789.29 = 12,155.04/x
3. Step 3: Cross multiply
   21,585.60x = 29,789.29 × 12,155.04
4. Step 4: Simplify right side
   21,585.60x = 362,090,011.52
5. Step 5: Solve for x
   x = 362,090,011.52/21,585.60
6. Step 6: Final answer
   x = 16,774.61