Finding the Fourth Proportional to 1,200.76, 1,798.38 and 789.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.76 : 1,798.38 = 789.76 : x
2. Step 2: Convert to fraction form
   1,200.76/1,798.38 = 789.76/x
3. Step 3: Cross multiply
   1,200.76x = 1,798.38 × 789.76
4. Step 4: Simplify right side
   1,200.76x = 1,420,288.59
5. Step 5: Solve for x
   x = 1,420,288.59/1,200.76
6. Step 6: Final answer
   x = 1,182.82