Finding the Fourth Proportional to 1,379.00, 1,903.22 and 855.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.00 : 1,903.22 = 855.20 : x
2. Step 2: Convert to fraction form
   1,379.00/1,903.22 = 855.20/x
3. Step 3: Cross multiply
   1,379.00x = 1,903.22 × 855.20
4. Step 4: Simplify right side
   1,379.00x = 1,627,619.95
5. Step 5: Solve for x
   x = 1,627,619.95/1,379.00
6. Step 6: Final answer
   x = 1,180.29