Finding the Fourth Proportional to 3,987.94, 5,510.94 and 2,991.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.94 : 5,510.94 = 2,991.48 : x
2. Step 2: Convert to fraction form
   3,987.94/5,510.94 = 2,991.48/x
3. Step 3: Cross multiply
   3,987.94x = 5,510.94 × 2,991.48
4. Step 4: Simplify right side
   3,987.94x = 16,485,851.83
5. Step 5: Solve for x
   x = 16,485,851.83/3,987.94
6. Step 6: Final answer
   x = 4,133.93