Finding the Fourth Proportional to 2,145.30, 2,960.64 and 1,261.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.30 : 2,960.64 = 1,261.24 : x
2. Step 2: Convert to fraction form
   2,145.30/2,960.64 = 1,261.24/x
3. Step 3: Cross multiply
   2,145.30x = 2,960.64 × 1,261.24
4. Step 4: Simplify right side
   2,145.30x = 3,734,077.59
5. Step 5: Solve for x
   x = 3,734,077.59/2,145.30
6. Step 6: Final answer
   x = 1,740.59