Finding the Fourth Proportional to 1,061.55, 1,591.52 and 411.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.55 : 1,591.52 = 411.93 : x
2. Step 2: Convert to fraction form
   1,061.55/1,591.52 = 411.93/x
3. Step 3: Cross multiply
   1,061.55x = 1,591.52 × 411.93
4. Step 4: Simplify right side
   1,061.55x = 655,592.77
5. Step 5: Solve for x
   x = 655,592.77/1,061.55
6. Step 6: Final answer
   x = 617.58