Finding the Fourth Proportional to 2,142.80, 2,956.93 and 1,357.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.80 : 2,956.93 = 1,357.10 : x
2. Step 2: Convert to fraction form
   2,142.80/2,956.93 = 1,357.10/x
3. Step 3: Cross multiply
   2,142.80x = 2,956.93 × 1,357.10
4. Step 4: Simplify right side
   2,142.80x = 4,012,831.53
5. Step 5: Solve for x
   x = 4,012,831.53/2,142.80
6. Step 6: Final answer
   x = 1,872.71