Finding the Fourth Proportional to 1,304.43, 1,956.18 and 426.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.43 : 1,956.18 = 426.72 : x
2. Step 2: Convert to fraction form
   1,304.43/1,956.18 = 426.72/x
3. Step 3: Cross multiply
   1,304.43x = 1,956.18 × 426.72
4. Step 4: Simplify right side
   1,304.43x = 834,741.13
5. Step 5: Solve for x
   x = 834,741.13/1,304.43
6. Step 6: Final answer
   x = 639.93