Finding the Fourth Proportional to 1,061.01, 1,591.49 and 320.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.01 : 1,591.49 = 320.60 : x
2. Step 2: Convert to fraction form
   1,061.01/1,591.49 = 320.60/x
3. Step 3: Cross multiply
   1,061.01x = 1,591.49 × 320.60
4. Step 4: Simplify right side
   1,061.01x = 510,231.69
5. Step 5: Solve for x
   x = 510,231.69/1,061.01
6. Step 6: Final answer
   x = 480.89