Finding the Fourth Proportional to 1,377.37, 1,900.97 and 853.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.37 : 1,900.97 = 853.57 : x
2. Step 2: Convert to fraction form
   1,377.37/1,900.97 = 853.57/x
3. Step 3: Cross multiply
   1,377.37x = 1,900.97 × 853.57
4. Step 4: Simplify right side
   1,377.37x = 1,622,610.96
5. Step 5: Solve for x
   x = 1,622,610.96/1,377.37
6. Step 6: Final answer
   x = 1,178.05