Finding the Fourth Proportional to 1,060.81, 1,591.18 and 411.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,060.81 : 1,591.18 = 411.69 : x
2. Step 2: Convert to fraction form
   1,060.81/1,591.18 = 411.69/x
3. Step 3: Cross multiply
   1,060.81x = 1,591.18 × 411.69
4. Step 4: Simplify right side
   1,060.81x = 655,072.89
5. Step 5: Solve for x
   x = 655,072.89/1,060.81
6. Step 6: Final answer
   x = 617.52