Finding the Fourth Proportional to 1,002.94, 1,505.05 and 425.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.94 : 1,505.05 = 425.81 : x
2. Step 2: Convert to fraction form
   1,002.94/1,505.05 = 425.81/x
3. Step 3: Cross multiply
   1,002.94x = 1,505.05 × 425.81
4. Step 4: Simplify right side
   1,002.94x = 640,868.04
5. Step 5: Solve for x
   x = 640,868.04/1,002.94
6. Step 6: Final answer
   x = 638.99