Finding the Fourth Proportional to 1,403.37, 2,105.42 and 581.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.37 : 2,105.42 = 581.72 : x
2. Step 2: Convert to fraction form
   1,403.37/2,105.42 = 581.72/x
3. Step 3: Cross multiply
   1,403.37x = 2,105.42 × 581.72
4. Step 4: Simplify right side
   1,403.37x = 1,224,751.49
5. Step 5: Solve for x
   x = 1,224,751.49/1,403.37
6. Step 6: Final answer
   x = 872.72