Finding the Fourth Proportional to 1,375.61, 1,897.74 and 920.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.61 : 1,897.74 = 920.82 : x
2. Step 2: Convert to fraction form
   1,375.61/1,897.74 = 920.82/x
3. Step 3: Cross multiply
   1,375.61x = 1,897.74 × 920.82
4. Step 4: Simplify right side
   1,375.61x = 1,747,472.20
5. Step 5: Solve for x
   x = 1,747,472.20/1,375.61
6. Step 6: Final answer
   x = 1,270.33