Finding the Fourth Proportional to 3,986.29, 5,978.52 and 1,174.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.29 : 5,978.52 = 1,174.40 : x
2. Step 2: Convert to fraction form
   3,986.29/5,978.52 = 1,174.40/x
3. Step 3: Cross multiply
   3,986.29x = 5,978.52 × 1,174.40
4. Step 4: Simplify right side
   3,986.29x = 7,021,170.82
5. Step 5: Solve for x
   x = 7,021,170.82/3,986.29
6. Step 6: Final answer
   x = 1,761.33