Finding the Fourth Proportional to 2,417.98, 3,627.17 and 857.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,417.98 : 3,627.17 = 857.72 : x
2. Step 2: Convert to fraction form
   2,417.98/3,627.17 = 857.72/x
3. Step 3: Cross multiply
   2,417.98x = 3,627.17 × 857.72
4. Step 4: Simplify right side
   2,417.98x = 3,111,096.25
5. Step 5: Solve for x
   x = 3,111,096.25/2,417.98
6. Step 6: Final answer
   x = 1,286.65