Finding the Fourth Proportional to 7,120.72, 9,826.96 and 4,288.56

Step by Step Solution

1. Step 1: Write the proportion equation
   7,120.72 : 9,826.96 = 4,288.56 : x
2. Step 2: Convert to fraction form
   7,120.72/9,826.96 = 4,288.56/x
3. Step 3: Cross multiply
   7,120.72x = 9,826.96 × 4,288.56
4. Step 4: Simplify right side
   7,120.72x = 42,143,507.58
5. Step 5: Solve for x
   x = 42,143,507.58/7,120.72
6. Step 6: Final answer
   x = 5,918.43