Finding the Fourth Proportional to 1,355.91, 1,870.89 and 858.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.91 : 1,870.89 = 858.27 : x
2. Step 2: Convert to fraction form
   1,355.91/1,870.89 = 858.27/x
3. Step 3: Cross multiply
   1,355.91x = 1,870.89 × 858.27
4. Step 4: Simplify right side
   1,355.91x = 1,605,728.76
5. Step 5: Solve for x
   x = 1,605,728.76/1,355.91
6. Step 6: Final answer
   x = 1,184.24