Finding the Fourth Proportional to 3,859.63, 5,786.86 and 1,776.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,859.63 : 5,786.86 = 1,776.81 : x
2. Step 2: Convert to fraction form
   3,859.63/5,786.86 = 1,776.81/x
3. Step 3: Cross multiply
   3,859.63x = 5,786.86 × 1,776.81
4. Step 4: Simplify right side
   3,859.63x = 10,282,150.72
5. Step 5: Solve for x
   x = 10,282,150.72/3,859.63
6. Step 6: Final answer
   x = 2,664.02