Finding the Fourth Proportional to 3,858.62, 5,786.72 and 1,393.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,858.62 : 5,786.72 = 1,393.12 : x
2. Step 2: Convert to fraction form
   3,858.62/5,786.72 = 1,393.12/x
3. Step 3: Cross multiply
   3,858.62x = 5,786.72 × 1,393.12
4. Step 4: Simplify right side
   3,858.62x = 8,061,595.37
5. Step 5: Solve for x
   x = 8,061,595.37/3,858.62
6. Step 6: Final answer
   x = 2,089.24