Finding the Fourth Proportional to 1,279.98, 1,919.59 and 549.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.98 : 1,919.59 = 549.38 : x
2. Step 2: Convert to fraction form
   1,279.98/1,919.59 = 549.38/x
3. Step 3: Cross multiply
   1,279.98x = 1,919.59 × 549.38
4. Step 4: Simplify right side
   1,279.98x = 1,054,581.61
5. Step 5: Solve for x
   x = 1,054,581.61/1,279.98
6. Step 6: Final answer
   x = 823.90