Finding the Fourth Proportional to 1,061.28, 1,591.92 and 412.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.28 : 1,591.92 = 412.01 : x
2. Step 2: Convert to fraction form
   1,061.28/1,591.92 = 412.01/x
3. Step 3: Cross multiply
   1,061.28x = 1,591.92 × 412.01
4. Step 4: Simplify right side
   1,061.28x = 655,886.96
5. Step 5: Solve for x
   x = 655,886.96/1,061.28
6. Step 6: Final answer
   x = 618.02