Finding the Fourth Proportional to 21,585.73, 29,788.73 and 13,085.77

Step by Step Solution

1. Step 1: Write the proportion equation
   21,585.73 : 29,788.73 = 13,085.77 : x
2. Step 2: Convert to fraction form
   21,585.73/29,788.73 = 13,085.77/x
3. Step 3: Cross multiply
   21,585.73x = 29,788.73 × 13,085.77
4. Step 4: Simplify right side
   21,585.73x = 389,808,469.37
5. Step 5: Solve for x
   x = 389,808,469.37/21,585.73
6. Step 6: Final answer
   x = 18,058.62