Finding the Fourth Proportional to 15,826.50, 21,840.57 and 9,540.18

Step by Step Solution

1. Step 1: Write the proportion equation
   15,826.50 : 21,840.57 = 9,540.18 : x
2. Step 2: Convert to fraction form
   15,826.50/21,840.57 = 9,540.18/x
3. Step 3: Cross multiply
   15,826.50x = 21,840.57 × 9,540.18
4. Step 4: Simplify right side
   15,826.50x = 208,362,969.10
5. Step 5: Solve for x
   x = 208,362,969.10/15,826.50
6. Step 6: Final answer
   x = 13,165.45