Finding the Fourth Proportional to 1,021.06, 1,530.72 and 404.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,021.06 : 1,530.72 = 404.62 : x
2. Step 2: Convert to fraction form
   1,021.06/1,530.72 = 404.62/x
3. Step 3: Cross multiply
   1,021.06x = 1,530.72 × 404.62
4. Step 4: Simplify right side
   1,021.06x = 619,359.93
5. Step 5: Solve for x
   x = 619,359.93/1,021.06
6. Step 6: Final answer
   x = 606.59