Finding the Fourth Proportional to 7,863.77, 11,790.18 and 3,478.83

Step by Step Solution

1. Step 1: Write the proportion equation
   7,863.77 : 11,790.18 = 3,478.83 : x
2. Step 2: Convert to fraction form
   7,863.77/11,790.18 = 3,478.83/x
3. Step 3: Cross multiply
   7,863.77x = 11,790.18 × 3,478.83
4. Step 4: Simplify right side
   7,863.77x = 41,016,031.89
5. Step 5: Solve for x
   x = 41,016,031.89/7,863.77
6. Step 6: Final answer
   x = 5,215.83