Finding the Fourth Proportional to 2,571.78, 3,859.71 and 929.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,571.78 : 3,859.71 = 929.47 : x
2. Step 2: Convert to fraction form
   2,571.78/3,859.71 = 929.47/x
3. Step 3: Cross multiply
   2,571.78x = 3,859.71 × 929.47
4. Step 4: Simplify right side
   2,571.78x = 3,587,484.65
5. Step 5: Solve for x
   x = 3,587,484.65/2,571.78
6. Step 6: Final answer
   x = 1,394.94