Finding the Fourth Proportional to 3,985.29, 5,977.89 and 1,388.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.29 : 5,977.89 = 1,388.22 : x
2. Step 2: Convert to fraction form
   3,985.29/5,977.89 = 1,388.22/x
3. Step 3: Cross multiply
   3,985.29x = 5,977.89 × 1,388.22
4. Step 4: Simplify right side
   3,985.29x = 8,298,626.46
5. Step 5: Solve for x
   x = 8,298,626.46/3,985.29
6. Step 6: Final answer
   x = 2,082.31