Finding the Fourth Proportional to 2,995.25, 4,490.94 and 1,239.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,995.25 : 4,490.94 = 1,239.78 : x
2. Step 2: Convert to fraction form
   2,995.25/4,490.94 = 1,239.78/x
3. Step 3: Cross multiply
   2,995.25x = 4,490.94 × 1,239.78
4. Step 4: Simplify right side
   2,995.25x = 5,567,777.59
5. Step 5: Solve for x
   x = 5,567,777.59/2,995.25
6. Step 6: Final answer
   x = 1,858.87