Finding the Fourth Proportional to 2,318.52, 3,477.69 and 857.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,318.52 : 3,477.69 = 857.10 : x
2. Step 2: Convert to fraction form
   2,318.52/3,477.69 = 857.10/x
3. Step 3: Cross multiply
   2,318.52x = 3,477.69 × 857.10
4. Step 4: Simplify right side
   2,318.52x = 2,980,728.10
5. Step 5: Solve for x
   x = 2,980,728.10/2,318.52
6. Step 6: Final answer
   x = 1,285.62