Finding the Fourth Proportional to 1,361.72, 1,879.54 and 1,140.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.72 : 1,879.54 = 1,140.32 : x
2. Step 2: Convert to fraction form
   1,361.72/1,879.54 = 1,140.32/x
3. Step 3: Cross multiply
   1,361.72x = 1,879.54 × 1,140.32
4. Step 4: Simplify right side
   1,361.72x = 2,143,278.90
5. Step 5: Solve for x
   x = 2,143,278.90/1,361.72
6. Step 6: Final answer
   x = 1,573.95