Finding the Fourth Proportional to 2,066.40, 2,851.20 and 1,279.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,066.40 : 2,851.20 = 1,279.98 : x
2. Step 2: Convert to fraction form
   2,066.40/2,851.20 = 1,279.98/x
3. Step 3: Cross multiply
   2,066.40x = 2,851.20 × 1,279.98
4. Step 4: Simplify right side
   2,066.40x = 3,649,478.98
5. Step 5: Solve for x
   x = 3,649,478.98/2,066.40
6. Step 6: Final answer
   x = 1,766.10