Finding the Fourth Proportional to 2,146.10, 2,960.42 and 1,261.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.10 : 2,960.42 = 1,261.78 : x
2. Step 2: Convert to fraction form
   2,146.10/2,960.42 = 1,261.78/x
3. Step 3: Cross multiply
   2,146.10x = 2,960.42 × 1,261.78
4. Step 4: Simplify right side
   2,146.10x = 3,735,385.04
5. Step 5: Solve for x
   x = 3,735,385.04/2,146.10
6. Step 6: Final answer
   x = 1,740.55