Finding the Fourth Proportional to 15,870.62, 21,901.23 and 8,796.89

Step by Step Solution

1. Step 1: Write the proportion equation
   15,870.62 : 21,901.23 = 8,796.89 : x
2. Step 2: Convert to fraction form
   15,870.62/21,901.23 = 8,796.89/x
3. Step 3: Cross multiply
   15,870.62x = 21,901.23 × 8,796.89
4. Step 4: Simplify right side
   15,870.62x = 192,662,601.67
5. Step 5: Solve for x
   x = 192,662,601.67/15,870.62
6. Step 6: Final answer
   x = 12,139.58