Finding the Fourth Proportional to 3,851.28, 5,777.37 and 1,385.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,851.28 : 5,777.37 = 1,385.89 : x
2. Step 2: Convert to fraction form
   3,851.28/5,777.37 = 1,385.89/x
3. Step 3: Cross multiply
   3,851.28x = 5,777.37 × 1,385.89
4. Step 4: Simplify right side
   3,851.28x = 8,006,799.31
5. Step 5: Solve for x
   x = 8,006,799.31/3,851.28
6. Step 6: Final answer
   x = 2,079.00