Finding the Fourth Proportional to 3,959.98, 5,464.89 and 2,191.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,959.98 : 5,464.89 = 2,191.78 : x
2. Step 2: Convert to fraction form
   3,959.98/5,464.89 = 2,191.78/x
3. Step 3: Cross multiply
   3,959.98x = 5,464.89 × 2,191.78
4. Step 4: Simplify right side
   3,959.98x = 11,977,836.60
5. Step 5: Solve for x
   x = 11,977,836.60/3,959.98
6. Step 6: Final answer
   x = 3,024.72