Finding the Fourth Proportional to 2,761.94, 4,140.56 and 1,200.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,761.94 : 4,140.56 = 1,200.78 : x
2. Step 2: Convert to fraction form
   2,761.94/4,140.56 = 1,200.78/x
3. Step 3: Cross multiply
   2,761.94x = 4,140.56 × 1,200.78
4. Step 4: Simplify right side
   2,761.94x = 4,971,904.64
5. Step 5: Solve for x
   x = 4,971,904.64/2,761.94
6. Step 6: Final answer
   x = 1,800.15