Finding the Fourth Proportional to 1,581.55, 2,372.29 and 855.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.55 : 2,372.29 = 855.72 : x
2. Step 2: Convert to fraction form
   1,581.55/2,372.29 = 855.72/x
3. Step 3: Cross multiply
   1,581.55x = 2,372.29 × 855.72
4. Step 4: Simplify right side
   1,581.55x = 2,030,013.86
5. Step 5: Solve for x
   x = 2,030,013.86/1,581.55
6. Step 6: Final answer
   x = 1,283.56