Finding the Fourth Proportional to 15,870.45, 21,901.92 and 8,796.42

Step by Step Solution

1. Step 1: Write the proportion equation
   15,870.45 : 21,901.92 = 8,796.42 : x
2. Step 2: Convert to fraction form
   15,870.45/21,901.92 = 8,796.42/x
3. Step 3: Cross multiply
   15,870.45x = 21,901.92 × 8,796.42
4. Step 4: Simplify right side
   15,870.45x = 192,658,487.13
5. Step 5: Solve for x
   x = 192,658,487.13/15,870.45
6. Step 6: Final answer
   x = 12,139.45