Finding the Fourth Proportional to 15,900.31, 21,942.69 and 8,730.88

Step by Step Solution

1. Step 1: Write the proportion equation
   15,900.31 : 21,942.69 = 8,730.88 : x
2. Step 2: Convert to fraction form
   15,900.31/21,942.69 = 8,730.88/x
3. Step 3: Cross multiply
   15,900.31x = 21,942.69 × 8,730.88
4. Step 4: Simplify right side
   15,900.31x = 191,578,993.27
5. Step 5: Solve for x
   x = 191,578,993.27/15,900.31
6. Step 6: Final answer
   x = 12,048.76