Finding the Fourth Proportional to 1,139.04, 1,569.72 and 1,045.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.04 : 1,569.72 = 1,045.92 : x
2. Step 2: Convert to fraction form
   1,139.04/1,569.72 = 1,045.92/x
3. Step 3: Cross multiply
   1,139.04x = 1,569.72 × 1,045.92
4. Step 4: Simplify right side
   1,139.04x = 1,641,801.54
5. Step 5: Solve for x
   x = 1,641,801.54/1,139.04
6. Step 6: Final answer
   x = 1,441.39