Finding the Fourth Proportional to 1,074.72, 1,612.31 and 425.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,074.72 : 1,612.31 = 425.46 : x
2. Step 2: Convert to fraction form
   1,074.72/1,612.31 = 425.46/x
3. Step 3: Cross multiply
   1,074.72x = 1,612.31 × 425.46
4. Step 4: Simplify right side
   1,074.72x = 685,973.41
5. Step 5: Solve for x
   x = 685,973.41/1,074.72
6. Step 6: Final answer
   x = 638.28