Finding the Fourth Proportional to 1,371.89, 1,893.15 and 774.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.89 : 1,893.15 = 774.40 : x
2. Step 2: Convert to fraction form
   1,371.89/1,893.15 = 774.40/x
3. Step 3: Cross multiply
   1,371.89x = 1,893.15 × 774.40
4. Step 4: Simplify right side
   1,371.89x = 1,466,055.36
5. Step 5: Solve for x
   x = 1,466,055.36/1,371.89
6. Step 6: Final answer
   x = 1,068.64