Finding the Fourth Proportional to 1,042.62, 1,438.67 and 885.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.62 : 1,438.67 = 885.89 : x
2. Step 2: Convert to fraction form
   1,042.62/1,438.67 = 885.89/x
3. Step 3: Cross multiply
   1,042.62x = 1,438.67 × 885.89
4. Step 4: Simplify right side
   1,042.62x = 1,274,498.39
5. Step 5: Solve for x
   x = 1,274,498.39/1,042.62
6. Step 6: Final answer
   x = 1,222.40