Finding the Fourth Proportional to 8,299.71, 12,436.58 and 5,215.23

Step by Step Solution

1. Step 1: Write the proportion equation
   8,299.71 : 12,436.58 = 5,215.23 : x
2. Step 2: Convert to fraction form
   8,299.71/12,436.58 = 5,215.23/x
3. Step 3: Cross multiply
   8,299.71x = 12,436.58 × 5,215.23
4. Step 4: Simplify right side
   8,299.71x = 64,859,638.15
5. Step 5: Solve for x
   x = 64,859,638.15/8,299.71
6. Step 6: Final answer
   x = 7,814.69