Finding the Fourth Proportional to 1,081.35, 1,488.98 and 922.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.35 : 1,488.98 = 922.79 : x
2. Step 2: Convert to fraction form
   1,081.35/1,488.98 = 922.79/x
3. Step 3: Cross multiply
   1,081.35x = 1,488.98 × 922.79
4. Step 4: Simplify right side
   1,081.35x = 1,374,021.88
5. Step 5: Solve for x
   x = 1,374,021.88/1,081.35
6. Step 6: Final answer
   x = 1,270.65