Finding the Fourth Proportional to 2,851.80, 4,274.10 and 1,290.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,851.80 : 4,274.10 = 1,290.12 : x
2. Step 2: Convert to fraction form
   2,851.80/4,274.10 = 1,290.12/x
3. Step 3: Cross multiply
   2,851.80x = 4,274.10 × 1,290.12
4. Step 4: Simplify right side
   2,851.80x = 5,514,101.89
5. Step 5: Solve for x
   x = 5,514,101.89/2,851.80
6. Step 6: Final answer
   x = 1,933.55