Finding the Fourth Proportional to 7,815.29, 10,785.15 and 4,278.83

Step by Step Solution

1. Step 1: Write the proportion equation
   7,815.29 : 10,785.15 = 4,278.83 : x
2. Step 2: Convert to fraction form
   7,815.29/10,785.15 = 4,278.83/x
3. Step 3: Cross multiply
   7,815.29x = 10,785.15 × 4,278.83
4. Step 4: Simplify right side
   7,815.29x = 46,147,769.45
5. Step 5: Solve for x
   x = 46,147,769.45/7,815.29
6. Step 6: Final answer
   x = 5,904.81