Finding the Fourth Proportional to 15,870.72, 21,901.74 and 8,796.98

Step by Step Solution

1. Step 1: Write the proportion equation
   15,870.72 : 21,901.74 = 8,796.98 : x
2. Step 2: Convert to fraction form
   15,870.72/21,901.74 = 8,796.98/x
3. Step 3: Cross multiply
   15,870.72x = 21,901.74 × 8,796.98
4. Step 4: Simplify right side
   15,870.72x = 192,669,168.75
5. Step 5: Solve for x
   x = 192,669,168.75/15,870.72
6. Step 6: Final answer
   x = 12,139.91