Finding the Fourth Proportional to 2,851.39, 3,929.78 and 2,064.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,851.39 : 3,929.78 = 2,064.07 : x
2. Step 2: Convert to fraction form
   2,851.39/3,929.78 = 2,064.07/x
3. Step 3: Cross multiply
   2,851.39x = 3,929.78 × 2,064.07
4. Step 4: Simplify right side
   2,851.39x = 8,111,341.00
5. Step 5: Solve for x
   x = 8,111,341.00/2,851.39
6. Step 6: Final answer
   x = 2,844.70