Finding the Fourth Proportional to 15,906.15, 21,952.50 and 9,618.51

Step by Step Solution

1. Step 1: Write the proportion equation
   15,906.15 : 21,952.50 = 9,618.51 : x
2. Step 2: Convert to fraction form
   15,906.15/21,952.50 = 9,618.51/x
3. Step 3: Cross multiply
   15,906.15x = 21,952.50 × 9,618.51
4. Step 4: Simplify right side
   15,906.15x = 211,150,340.78
5. Step 5: Solve for x
   x = 211,150,340.78/15,906.15
6. Step 6: Final answer
   x = 13,274.76