Finding the Fourth Proportional to 2,145.79, 2,959.89 and 1,260.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.79 : 2,959.89 = 1,260.86 : x
2. Step 2: Convert to fraction form
   2,145.79/2,959.89 = 1,260.86/x
3. Step 3: Cross multiply
   2,145.79x = 2,959.89 × 1,260.86
4. Step 4: Simplify right side
   2,145.79x = 3,732,006.91
5. Step 5: Solve for x
   x = 3,732,006.91/2,145.79
6. Step 6: Final answer
   x = 1,739.23