Finding the Fourth Proportional to 3,986.30, 5,978.72 and 1,520.58

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.30 : 5,978.72 = 1,520.58 : x
2. Step 2: Convert to fraction form
   3,986.30/5,978.72 = 1,520.58/x
3. Step 3: Cross multiply
   3,986.30x = 5,978.72 × 1,520.58
4. Step 4: Simplify right side
   3,986.30x = 9,091,122.06
5. Step 5: Solve for x
   x = 9,091,122.06/3,986.30
6. Step 6: Final answer
   x = 2,280.59