Finding the Fourth Proportional to 1,279.82, 1,918.06 and 1,247.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.82 : 1,918.06 = 1,247.63 : x
2. Step 2: Convert to fraction form
   1,279.82/1,918.06 = 1,247.63/x
3. Step 3: Cross multiply
   1,279.82x = 1,918.06 × 1,247.63
4. Step 4: Simplify right side
   1,279.82x = 2,393,016.49
5. Step 5: Solve for x
   x = 2,393,016.49/1,279.82
6. Step 6: Final answer
   x = 1,869.80