Finding the Fourth Proportional to 1,061.20, 1,591.98 and 412.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.20 : 1,591.98 = 412.03 : x
2. Step 2: Convert to fraction form
   1,061.20/1,591.98 = 412.03/x
3. Step 3: Cross multiply
   1,061.20x = 1,591.98 × 412.03
4. Step 4: Simplify right side
   1,061.20x = 655,943.52
5. Step 5: Solve for x
   x = 655,943.52/1,061.20
6. Step 6: Final answer
   x = 618.11