Finding the Fourth Proportional to 1,061.31, 1,591.16 and 411.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.31 : 1,591.16 = 411.69 : x
2. Step 2: Convert to fraction form
   1,061.31/1,591.16 = 411.69/x
3. Step 3: Cross multiply
   1,061.31x = 1,591.16 × 411.69
4. Step 4: Simplify right side
   1,061.31x = 655,062.60
5. Step 5: Solve for x
   x = 655,062.60/1,061.31
6. Step 6: Final answer
   x = 617.22