Finding the Fourth Proportional to 3,985.10, 5,978.69 and 1,518.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.10 : 5,978.69 = 1,518.59 : x
2. Step 2: Convert to fraction form
   3,985.10/5,978.69 = 1,518.59/x
3. Step 3: Cross multiply
   3,985.10x = 5,978.69 × 1,518.59
4. Step 4: Simplify right side
   3,985.10x = 9,079,141.36
5. Step 5: Solve for x
   x = 9,079,141.36/3,985.10
6. Step 6: Final answer
   x = 2,278.27