Finding the Fourth Proportional to 1,052.55, 1,581.27 and 911.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,052.55 : 1,581.27 = 911.61 : x
2. Step 2: Convert to fraction form
   1,052.55/1,581.27 = 911.61/x
3. Step 3: Cross multiply
   1,052.55x = 1,581.27 × 911.61
4. Step 4: Simplify right side
   1,052.55x = 1,441,501.54
5. Step 5: Solve for x
   x = 1,441,501.54/1,052.55
6. Step 6: Final answer
   x = 1,369.53