Finding the Fourth Proportional to 2,159.30, 2,980.42 and 1,275.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.30 : 2,980.42 = 1,275.42 : x
2. Step 2: Convert to fraction form
   2,159.30/2,980.42 = 1,275.42/x
3. Step 3: Cross multiply
   2,159.30x = 2,980.42 × 1,275.42
4. Step 4: Simplify right side
   2,159.30x = 3,801,287.28
5. Step 5: Solve for x
   x = 3,801,287.28/2,159.30
6. Step 6: Final answer
   x = 1,760.43