Finding the Fourth Proportional to 1,355.94, 1,871.10 and 766.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.94 : 1,871.10 = 766.44 : x
2. Step 2: Convert to fraction form
   1,355.94/1,871.10 = 766.44/x
3. Step 3: Cross multiply
   1,355.94x = 1,871.10 × 766.44
4. Step 4: Simplify right side
   1,355.94x = 1,434,085.88
5. Step 5: Solve for x
   x = 1,434,085.88/1,355.94
6. Step 6: Final answer
   x = 1,057.63