Finding the Fourth Proportional to 1,379.86, 1,903.40 and 855.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.86 : 1,903.40 = 855.52 : x
2. Step 2: Convert to fraction form
   1,379.86/1,903.40 = 855.52/x
3. Step 3: Cross multiply
   1,379.86x = 1,903.40 × 855.52
4. Step 4: Simplify right side
   1,379.86x = 1,628,396.77
5. Step 5: Solve for x
   x = 1,628,396.77/1,379.86
6. Step 6: Final answer
   x = 1,180.12