Finding the Fourth Proportional to 1,279.63, 1,919.89 and 630.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.63 : 1,919.89 = 630.82 : x
2. Step 2: Convert to fraction form
   1,279.63/1,919.89 = 630.82/x
3. Step 3: Cross multiply
   1,279.63x = 1,919.89 × 630.82
4. Step 4: Simplify right side
   1,279.63x = 1,211,095.41
5. Step 5: Solve for x
   x = 1,211,095.41/1,279.63
6. Step 6: Final answer
   x = 946.45