Finding the Fourth Proportional to 2,159.62, 2,980.29 and 1,275.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.62 : 2,980.29 = 1,275.86 : x
2. Step 2: Convert to fraction form
   2,159.62/2,980.29 = 1,275.86/x
3. Step 3: Cross multiply
   2,159.62x = 2,980.29 × 1,275.86
4. Step 4: Simplify right side
   2,159.62x = 3,802,411.52
5. Step 5: Solve for x
   x = 3,802,411.52/2,159.62
6. Step 6: Final answer
   x = 1,760.69