Finding the Fourth Proportional to 1,356.38, 1,871.90 and 766.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.38 : 1,871.90 = 766.98 : x
2. Step 2: Convert to fraction form
   1,356.38/1,871.90 = 766.98/x
3. Step 3: Cross multiply
   1,356.38x = 1,871.90 × 766.98
4. Step 4: Simplify right side
   1,356.38x = 1,435,709.86
5. Step 5: Solve for x
   x = 1,435,709.86/1,356.38
6. Step 6: Final answer
   x = 1,058.49