Finding the Fourth Proportional to 2,570.72, 3,855.17 and 926.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.72 : 3,855.17 = 926.83 : x
2. Step 2: Convert to fraction form
   2,570.72/3,855.17 = 926.83/x
3. Step 3: Cross multiply
   2,570.72x = 3,855.17 × 926.83
4. Step 4: Simplify right side
   2,570.72x = 3,573,087.21
5. Step 5: Solve for x
   x = 3,573,087.21/2,570.72
6. Step 6: Final answer
   x = 1,389.92