Finding the Fourth Proportional to 1,002.42, 1,504.47 and 425.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.42 : 1,504.47 = 425.46 : x
2. Step 2: Convert to fraction form
   1,002.42/1,504.47 = 425.46/x
3. Step 3: Cross multiply
   1,002.42x = 1,504.47 × 425.46
4. Step 4: Simplify right side
   1,002.42x = 640,091.81
5. Step 5: Solve for x
   x = 640,091.81/1,002.42
6. Step 6: Final answer
   x = 638.55