Finding the Fourth Proportional to 1,060.50, 1,590.78 and 411.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,060.50 : 1,590.78 = 411.18 : x
2. Step 2: Convert to fraction form
   1,060.50/1,590.78 = 411.18/x
3. Step 3: Cross multiply
   1,060.50x = 1,590.78 × 411.18
4. Step 4: Simplify right side
   1,060.50x = 654,096.92
5. Step 5: Solve for x
   x = 654,096.92/1,060.50
6. Step 6: Final answer
   x = 616.78