Finding the Fourth Proportional to 1,041.35, 1,561.63 and 424.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,041.35 : 1,561.63 = 424.72 : x
2. Step 2: Convert to fraction form
   1,041.35/1,561.63 = 424.72/x
3. Step 3: Cross multiply
   1,041.35x = 1,561.63 × 424.72
4. Step 4: Simplify right side
   1,041.35x = 663,255.49
5. Step 5: Solve for x
   x = 663,255.49/1,041.35
6. Step 6: Final answer
   x = 636.92