Finding the Fourth Proportional to 1,061.30, 1,591.41 and 412.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.30 : 1,591.41 = 412.22 : x
2. Step 2: Convert to fraction form
   1,061.30/1,591.41 = 412.22/x
3. Step 3: Cross multiply
   1,061.30x = 1,591.41 × 412.22
4. Step 4: Simplify right side
   1,061.30x = 656,011.03
5. Step 5: Solve for x
   x = 656,011.03/1,061.30
6. Step 6: Final answer
   x = 618.12