Finding the Fourth Proportional to 10,826.20, 16,239.48 and 3,430.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,826.20 : 16,239.48 = 3,430.72 : x
2. Step 2: Convert to fraction form
   10,826.20/16,239.48 = 3,430.72/x
3. Step 3: Cross multiply
   10,826.20x = 16,239.48 × 3,430.72
4. Step 4: Simplify right side
   10,826.20x = 55,713,108.83
5. Step 5: Solve for x
   x = 55,713,108.83/10,826.20
6. Step 6: Final answer
   x = 5,146.14