Finding the Fourth Proportional to 1,371.89, 1,893.42 and 1,039.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.89 : 1,893.42 = 1,039.77 : x
2. Step 2: Convert to fraction form
   1,371.89/1,893.42 = 1,039.77/x
3. Step 3: Cross multiply
   1,371.89x = 1,893.42 × 1,039.77
4. Step 4: Simplify right side
   1,371.89x = 1,968,721.31
5. Step 5: Solve for x
   x = 1,968,721.31/1,371.89
6. Step 6: Final answer
   x = 1,435.04