Finding the Fourth Proportional to 15,870.28, 21,901.18 and 8,796.82

Step by Step Solution

1. Step 1: Write the proportion equation
   15,870.28 : 21,901.18 = 8,796.82 : x
2. Step 2: Convert to fraction form
   15,870.28/21,901.18 = 8,796.82/x
3. Step 3: Cross multiply
   15,870.28x = 21,901.18 × 8,796.82
4. Step 4: Simplify right side
   15,870.28x = 192,660,738.25
5. Step 5: Solve for x
   x = 192,660,738.25/15,870.28
6. Step 6: Final answer
   x = 12,139.72