Finding the Fourth Proportional to 1,061.01, 1,591.61 and 411.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.01 : 1,591.61 = 411.75 : x
2. Step 2: Convert to fraction form
   1,061.01/1,591.61 = 411.75/x
3. Step 3: Cross multiply
   1,061.01x = 1,591.61 × 411.75
4. Step 4: Simplify right side
   1,061.01x = 655,343.36
5. Step 5: Solve for x
   x = 655,343.36/1,061.01
6. Step 6: Final answer
   x = 617.66