Finding the Fourth Proportional to 2,570.58, 3,854.71 and 815.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.58 : 3,854.71 = 815.08 : x
2. Step 2: Convert to fraction form
   2,570.58/3,854.71 = 815.08/x
3. Step 3: Cross multiply
   2,570.58x = 3,854.71 × 815.08
4. Step 4: Simplify right side
   2,570.58x = 3,141,897.03
5. Step 5: Solve for x
   x = 3,141,897.03/2,570.58
6. Step 6: Final answer
   x = 1,222.25