Finding the Fourth Proportional to 1,356.48, 1,871.82 and 766.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.48 : 1,871.82 = 766.90 : x
2. Step 2: Convert to fraction form
   1,356.48/1,871.82 = 766.90/x
3. Step 3: Cross multiply
   1,356.48x = 1,871.82 × 766.90
4. Step 4: Simplify right side
   1,356.48x = 1,435,498.76
5. Step 5: Solve for x
   x = 1,435,498.76/1,356.48
6. Step 6: Final answer
   x = 1,058.25