Finding the Fourth Proportional to 2,141.39, 2,955.12 and 1,257.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.39 : 2,955.12 = 1,257.20 : x
2. Step 2: Convert to fraction form
   2,141.39/2,955.12 = 1,257.20/x
3. Step 3: Cross multiply
   2,141.39x = 2,955.12 × 1,257.20
4. Step 4: Simplify right side
   2,141.39x = 3,715,176.86
5. Step 5: Solve for x
   x = 3,715,176.86/2,141.39
6. Step 6: Final answer
   x = 1,734.94