Finding the Fourth Proportional to 21,243.30, 31,878.81 and 8,095.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,243.30 : 31,878.81 = 8,095.79 : x
2. Step 2: Convert to fraction form
   21,243.30/31,878.81 = 8,095.79/x
3. Step 3: Cross multiply
   21,243.30x = 31,878.81 × 8,095.79
4. Step 4: Simplify right side
   21,243.30x = 258,083,991.82
5. Step 5: Solve for x
   x = 258,083,991.82/21,243.30
6. Step 6: Final answer
   x = 12,148.96