Finding the Fourth Proportional to 1,276.78, 1,761.78 and 835.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.78 : 1,761.78 = 835.30 : x
2. Step 2: Convert to fraction form
   1,276.78/1,761.78 = 835.30/x
3. Step 3: Cross multiply
   1,276.78x = 1,761.78 × 835.30
4. Step 4: Simplify right side
   1,276.78x = 1,471,614.83
5. Step 5: Solve for x
   x = 1,471,614.83/1,276.78
6. Step 6: Final answer
   x = 1,152.60