Finding the Fourth Proportional to 1,355.54, 1,869.92 and 857.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.54 : 1,869.92 = 857.99 : x
2. Step 2: Convert to fraction form
   1,355.54/1,869.92 = 857.99/x
3. Step 3: Cross multiply
   1,355.54x = 1,869.92 × 857.99
4. Step 4: Simplify right side
   1,355.54x = 1,604,376.26
5. Step 5: Solve for x
   x = 1,604,376.26/1,355.54
6. Step 6: Final answer
   x = 1,183.57