Finding the Fourth Proportional to 1,061.10, 1,590.99 and 411.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.10 : 1,590.99 = 411.68 : x
2. Step 2: Convert to fraction form
   1,061.10/1,590.99 = 411.68/x
3. Step 3: Cross multiply
   1,061.10x = 1,590.99 × 411.68
4. Step 4: Simplify right side
   1,061.10x = 654,970.81
5. Step 5: Solve for x
   x = 654,970.81/1,061.10
6. Step 6: Final answer
   x = 617.26