Finding the Fourth Proportional to 1,061.71, 1,591.95 and 411.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.71 : 1,591.95 = 411.68 : x
2. Step 2: Convert to fraction form
   1,061.71/1,591.95 = 411.68/x
3. Step 3: Cross multiply
   1,061.71x = 1,591.95 × 411.68
4. Step 4: Simplify right side
   1,061.71x = 655,373.04
5. Step 5: Solve for x
   x = 655,373.04/1,061.71
6. Step 6: Final answer
   x = 617.28