Finding the Fourth Proportional to 1,393.89, 1,899 and 1,365.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.89 : 1,899 = 1,365.44 : x
2. Step 2: Convert to fraction form
   1,393.89/1,899 = 1,365.44/x
3. Step 3: Cross multiply
   1,393.89x = 1,899 × 1,365.44
4. Step 4: Simplify right side
   1,393.89x = 2,592,961.07
5. Step 5: Solve for x
   x = 2,592,961.07/1,393.89
6. Step 6: Final answer
   x = 1,860.23