Finding the Fourth Proportional to 3,860.79, 5,786.55 and 1,777.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,860.79 : 5,786.55 = 1,777.94 : x
2. Step 2: Convert to fraction form
   3,860.79/5,786.55 = 1,777.94/x
3. Step 3: Cross multiply
   3,860.79x = 5,786.55 × 1,777.94
4. Step 4: Simplify right side
   3,860.79x = 10,288,109.77
5. Step 5: Solve for x
   x = 10,288,109.77/3,860.79
6. Step 6: Final answer
   x = 2,664.77