Finding the Fourth Proportional to 1,020.63, 1,531.67 and 404.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.63 : 1,531.67 = 404.47 : x
2. Step 2: Convert to fraction form
   1,020.63/1,531.67 = 404.47/x
3. Step 3: Cross multiply
   1,020.63x = 1,531.67 × 404.47
4. Step 4: Simplify right side
   1,020.63x = 619,509.29
5. Step 5: Solve for x
   x = 619,509.29/1,020.63
6. Step 6: Final answer
   x = 606.99