Finding the Fourth Proportional to 15,826.83, 21,826.58 and 13,587.99

Step by Step Solution

1. Step 1: Write the proportion equation
   15,826.83 : 21,826.58 = 13,587.99 : x
2. Step 2: Convert to fraction form
   15,826.83/21,826.58 = 13,587.99/x
3. Step 3: Cross multiply
   15,826.83x = 21,826.58 × 13,587.99
4. Step 4: Simplify right side
   15,826.83x = 296,579,282.83
5. Step 5: Solve for x
   x = 296,579,282.83/15,826.83
6. Step 6: Final answer
   x = 18,739.02