Finding the Fourth Proportional to 1,853.94, 2,778.51 and 1,388.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,853.94 : 2,778.51 = 1,388.07 : x
2. Step 2: Convert to fraction form
   1,853.94/2,778.51 = 1,388.07/x
3. Step 3: Cross multiply
   1,853.94x = 2,778.51 × 1,388.07
4. Step 4: Simplify right side
   1,853.94x = 3,856,766.38
5. Step 5: Solve for x
   x = 3,856,766.38/1,853.94
6. Step 6: Final answer
   x = 2,080.31