Finding the Fourth Proportional to 2,066.91, 2,851.20 and 1,309.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,066.91 : 2,851.20 = 1,309.31 : x
2. Step 2: Convert to fraction form
   2,066.91/2,851.20 = 1,309.31/x
3. Step 3: Cross multiply
   2,066.91x = 2,851.20 × 1,309.31
4. Step 4: Simplify right side
   2,066.91x = 3,733,098.61
5. Step 5: Solve for x
   x = 3,733,098.61/2,066.91
6. Step 6: Final answer
   x = 1,806.12