Finding the Fourth Proportional to 1,978.09, 2,729.73 and 1,279.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.09 : 2,729.73 = 1,279.48 : x
2. Step 2: Convert to fraction form
   1,978.09/2,729.73 = 1,279.48/x
3. Step 3: Cross multiply
   1,978.09x = 2,729.73 × 1,279.48
4. Step 4: Simplify right side
   1,978.09x = 3,492,634.94
5. Step 5: Solve for x
   x = 3,492,634.94/1,978.09
6. Step 6: Final answer
   x = 1,765.66