Finding the Fourth Proportional to 8,238.21, 12,359.28 and 2,691.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,238.21 : 12,359.28 = 2,691.57 : x
2. Step 2: Convert to fraction form
   8,238.21/12,359.28 = 2,691.57/x
3. Step 3: Cross multiply
   8,238.21x = 12,359.28 × 2,691.57
4. Step 4: Simplify right side
   8,238.21x = 33,265,867.27
5. Step 5: Solve for x
   x = 33,265,867.27/8,238.21
6. Step 6: Final answer
   x = 4,038.00