Finding the Fourth Proportional to 2,145.51, 2,960.82 and 1,261.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.51 : 2,960.82 = 1,261.35 : x
2. Step 2: Convert to fraction form
   2,145.51/2,960.82 = 1,261.35/x
3. Step 3: Cross multiply
   2,145.51x = 2,960.82 × 1,261.35
4. Step 4: Simplify right side
   2,145.51x = 3,734,630.31
5. Step 5: Solve for x
   x = 3,734,630.31/2,145.51
6. Step 6: Final answer
   x = 1,740.67