Finding the Fourth Proportional to 12,826.52, 19,243.16 and 5,431.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,826.52 : 19,243.16 = 5,431.28 : x
2. Step 2: Convert to fraction form
   12,826.52/19,243.16 = 5,431.28/x
3. Step 3: Cross multiply
   12,826.52x = 19,243.16 × 5,431.28
4. Step 4: Simplify right side
   12,826.52x = 104,514,990.04
5. Step 5: Solve for x
   x = 104,514,990.04/12,826.52
6. Step 6: Final answer
   x = 8,148.35