Finding the Fourth Proportional to 2,066.78, 2,851.71 and 1,310.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,066.78 : 2,851.71 = 1,310.79 : x
2. Step 2: Convert to fraction form
   2,066.78/2,851.71 = 1,310.79/x
3. Step 3: Cross multiply
   2,066.78x = 2,851.71 × 1,310.79
4. Step 4: Simplify right side
   2,066.78x = 3,737,992.95
5. Step 5: Solve for x
   x = 3,737,992.95/2,066.78
6. Step 6: Final answer
   x = 1,808.61