Finding the Fourth Proportional to 1,976.88, 2,728.12 and 1,279.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,976.88 : 2,728.12 = 1,279.47 : x
2. Step 2: Convert to fraction form
   1,976.88/2,728.12 = 1,279.47/x
3. Step 3: Cross multiply
   1,976.88x = 2,728.12 × 1,279.47
4. Step 4: Simplify right side
   1,976.88x = 3,490,547.70
5. Step 5: Solve for x
   x = 3,490,547.70/1,976.88
6. Step 6: Final answer
   x = 1,765.69