Finding the Fourth Proportional to 1,369.42, 1,890.41 and 1,054.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.42 : 1,890.41 = 1,054.57 : x
2. Step 2: Convert to fraction form
   1,369.42/1,890.41 = 1,054.57/x
3. Step 3: Cross multiply
   1,369.42x = 1,890.41 × 1,054.57
4. Step 4: Simplify right side
   1,369.42x = 1,993,569.67
5. Step 5: Solve for x
   x = 1,993,569.67/1,369.42
6. Step 6: Final answer
   x = 1,455.78