Finding the Fourth Proportional to 1,375.36, 1,897.40 and 920.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.36 : 1,897.40 = 920.57 : x
2. Step 2: Convert to fraction form
   1,375.36/1,897.40 = 920.57/x
3. Step 3: Cross multiply
   1,375.36x = 1,897.40 × 920.57
4. Step 4: Simplify right side
   1,375.36x = 1,746,679.56
5. Step 5: Solve for x
   x = 1,746,679.56/1,375.36
6. Step 6: Final answer
   x = 1,269.98