Finding the Fourth Proportional to 1,417.16, 1,955.76 and 857.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.16 : 1,955.76 = 857.72 : x
2. Step 2: Convert to fraction form
   1,417.16/1,955.76 = 857.72/x
3. Step 3: Cross multiply
   1,417.16x = 1,955.76 × 857.72
4. Step 4: Simplify right side
   1,417.16x = 1,677,494.47
5. Step 5: Solve for x
   x = 1,677,494.47/1,417.16
6. Step 6: Final answer
   x = 1,183.70