Finding the Fourth Proportional to 1,355.03, 1,869.92 and 765.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.03 : 1,869.92 = 765.54 : x
2. Step 2: Convert to fraction form
   1,355.03/1,869.92 = 765.54/x
3. Step 3: Cross multiply
   1,355.03x = 1,869.92 × 765.54
4. Step 4: Simplify right side
   1,355.03x = 1,431,494.73
5. Step 5: Solve for x
   x = 1,431,494.73/1,355.03
6. Step 6: Final answer
   x = 1,056.43