Finding the Fourth Proportional to 1,417.88, 1,956.71 and 858.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.88 : 1,956.71 = 858.25 : x
2. Step 2: Convert to fraction form
   1,417.88/1,956.71 = 858.25/x
3. Step 3: Cross multiply
   1,417.88x = 1,956.71 × 858.25
4. Step 4: Simplify right side
   1,417.88x = 1,679,335.11
5. Step 5: Solve for x
   x = 1,679,335.11/1,417.88
6. Step 6: Final answer
   x = 1,184.40