Finding the Fourth Proportional to 1,042.43, 1,438.32 and 622.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.43 : 1,438.32 = 622.72 : x
2. Step 2: Convert to fraction form
   1,042.43/1,438.32 = 622.72/x
3. Step 3: Cross multiply
   1,042.43x = 1,438.32 × 622.72
4. Step 4: Simplify right side
   1,042.43x = 895,667.03
5. Step 5: Solve for x
   x = 895,667.03/1,042.43
6. Step 6: Final answer
   x = 859.21