Finding the Fourth Proportional to 1,418.42, 1,957.46 and 858.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.42 : 1,957.46 = 858.99 : x
2. Step 2: Convert to fraction form
   1,418.42/1,957.46 = 858.99/x
3. Step 3: Cross multiply
   1,418.42x = 1,957.46 × 858.99
4. Step 4: Simplify right side
   1,418.42x = 1,681,438.57
5. Step 5: Solve for x
   x = 1,681,438.57/1,418.42
6. Step 6: Final answer
   x = 1,185.43