Finding the Fourth Proportional to 2,159.47, 2,980.02 and 1,275.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.47 : 2,980.02 = 1,275.31 : x
2. Step 2: Convert to fraction form
   2,159.47/2,980.02 = 1,275.31/x
3. Step 3: Cross multiply
   2,159.47x = 2,980.02 × 1,275.31
4. Step 4: Simplify right side
   2,159.47x = 3,800,449.31
5. Step 5: Solve for x
   x = 3,800,449.31/2,159.47
6. Step 6: Final answer
   x = 1,759.90