Finding the Fourth Proportional to 2,159.72, 2,980.46 and 1,275.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.72 : 2,980.46 = 1,275.20 : x
2. Step 2: Convert to fraction form
   2,159.72/2,980.46 = 1,275.20/x
3. Step 3: Cross multiply
   2,159.72x = 2,980.46 × 1,275.20
4. Step 4: Simplify right side
   2,159.72x = 3,800,682.59
5. Step 5: Solve for x
   x = 3,800,682.59/2,159.72
6. Step 6: Final answer
   x = 1,759.80