Finding the Fourth Proportional to 1,355.86, 1,872.23 and 859.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.86 : 1,872.23 = 859.38 : x
2. Step 2: Convert to fraction form
   1,355.86/1,872.23 = 859.38/x
3. Step 3: Cross multiply
   1,355.86x = 1,872.23 × 859.38
4. Step 4: Simplify right side
   1,355.86x = 1,608,957.02
5. Step 5: Solve for x
   x = 1,608,957.02/1,355.86
6. Step 6: Final answer
   x = 1,186.67