Finding the Fourth Proportional to 1,061.17, 1,590.82 and 411.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.17 : 1,590.82 = 411.45 : x
2. Step 2: Convert to fraction form
   1,061.17/1,590.82 = 411.45/x
3. Step 3: Cross multiply
   1,061.17x = 1,590.82 × 411.45
4. Step 4: Simplify right side
   1,061.17x = 654,542.89
5. Step 5: Solve for x
   x = 654,542.89/1,061.17
6. Step 6: Final answer
   x = 616.81