Finding the Fourth Proportional to 1,061.41, 1,591.50 and 411.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.41 : 1,591.50 = 411.39 : x
2. Step 2: Convert to fraction form
   1,061.41/1,591.50 = 411.39/x
3. Step 3: Cross multiply
   1,061.41x = 1,591.50 × 411.39
4. Step 4: Simplify right side
   1,061.41x = 654,719.23
5. Step 5: Solve for x
   x = 654,719.23/1,061.41
6. Step 6: Final answer
   x = 616.84