Finding the Fourth Proportional to 1,356.27, 1,871.62 and 766.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.27 : 1,871.62 = 766.79 : x
2. Step 2: Convert to fraction form
   1,356.27/1,871.62 = 766.79/x
3. Step 3: Cross multiply
   1,356.27x = 1,871.62 × 766.79
4. Step 4: Simplify right side
   1,356.27x = 1,435,139.50
5. Step 5: Solve for x
   x = 1,435,139.50/1,356.27
6. Step 6: Final answer
   x = 1,058.15