Finding the Fourth Proportional to 2,279.90, 3,146.38 and 1,285.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.90 : 3,146.38 = 1,285.18 : x
2. Step 2: Convert to fraction form
   2,279.90/3,146.38 = 1,285.18/x
3. Step 3: Cross multiply
   2,279.90x = 3,146.38 × 1,285.18
4. Step 4: Simplify right side
   2,279.90x = 4,043,667.73
5. Step 5: Solve for x
   x = 4,043,667.73/2,279.90
6. Step 6: Final answer
   x = 1,773.61