Finding the Fourth Proportional to 2,279.78, 3,145.75 and 1,335.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.78 : 3,145.75 = 1,335.42 : x
2. Step 2: Convert to fraction form
   2,279.78/3,145.75 = 1,335.42/x
3. Step 3: Cross multiply
   2,279.78x = 3,145.75 × 1,335.42
4. Step 4: Simplify right side
   2,279.78x = 4,200,897.47
5. Step 5: Solve for x
   x = 4,200,897.47/2,279.78
6. Step 6: Final answer
   x = 1,842.68