Finding the Fourth Proportional to 3,983.77, 5,978.15 and 1,518.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,983.77 : 5,978.15 = 1,518.80 : x
2. Step 2: Convert to fraction form
   3,983.77/5,978.15 = 1,518.80/x
3. Step 3: Cross multiply
   3,983.77x = 5,978.15 × 1,518.80
4. Step 4: Simplify right side
   3,983.77x = 9,079,606.63
5. Step 5: Solve for x
   x = 9,079,606.63/3,983.77
6. Step 6: Final answer
   x = 2,279.15