Finding the Fourth Proportional to 2,891.37, 3,988.55 and 1,945.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,891.37 : 3,988.55 = 1,945.55 : x
2. Step 2: Convert to fraction form
   2,891.37/3,988.55 = 1,945.55/x
3. Step 3: Cross multiply
   2,891.37x = 3,988.55 × 1,945.55
4. Step 4: Simplify right side
   2,891.37x = 7,759,923.45
5. Step 5: Solve for x
   x = 7,759,923.45/2,891.37
6. Step 6: Final answer
   x = 2,683.82