Finding the Fourth Proportional to 1,139.93, 1,574.37 and 1,046.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.93 : 1,574.37 = 1,046.54 : x
2. Step 2: Convert to fraction form
   1,139.93/1,574.37 = 1,046.54/x
3. Step 3: Cross multiply
   1,139.93x = 1,574.37 × 1,046.54
4. Step 4: Simplify right side
   1,139.93x = 1,647,641.18
5. Step 5: Solve for x
   x = 1,647,641.18/1,139.93
6. Step 6: Final answer
   x = 1,445.39