Finding the Fourth Proportional to 1,375.20, 1,897.20 and 850.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.20 : 1,897.20 = 850.86 : x
2. Step 2: Convert to fraction form
   1,375.20/1,897.20 = 850.86/x
3. Step 3: Cross multiply
   1,375.20x = 1,897.20 × 850.86
4. Step 4: Simplify right side
   1,375.20x = 1,614,251.59
5. Step 5: Solve for x
   x = 1,614,251.59/1,375.20
6. Step 6: Final answer
   x = 1,173.83