Finding the Fourth Proportional to 2,145.67, 2,960.47 and 1,261.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.67 : 2,960.47 = 1,261.30 : x
2. Step 2: Convert to fraction form
   2,145.67/2,960.47 = 1,261.30/x
3. Step 3: Cross multiply
   2,145.67x = 2,960.47 × 1,261.30
4. Step 4: Simplify right side
   2,145.67x = 3,734,040.81
5. Step 5: Solve for x
   x = 3,734,040.81/2,145.67
6. Step 6: Final answer
   x = 1,740.27