Finding the Fourth Proportional to 2,571.47, 3,857.52 and 815.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,571.47 : 3,857.52 = 815.99 : x
2. Step 2: Convert to fraction form
   2,571.47/3,857.52 = 815.99/x
3. Step 3: Cross multiply
   2,571.47x = 3,857.52 × 815.99
4. Step 4: Simplify right side
   2,571.47x = 3,147,678.46
5. Step 5: Solve for x
   x = 3,147,678.46/2,571.47
6. Step 6: Final answer
   x = 1,224.08