Finding the Fourth Proportional to 7,113.30, 9,815.61 and 4,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   7,113.30 : 9,815.61 = 4,128.56 : x
2. Step 2: Convert to fraction form
   7,113.30/9,815.61 = 4,128.56/x
3. Step 3: Cross multiply
   7,113.30x = 9,815.61 × 4,128.56
4. Step 4: Simplify right side
   7,113.30x = 40,524,334.82
5. Step 5: Solve for x
   x = 40,524,334.82/7,113.30
6. Step 6: Final answer
   x = 5,696.98