Finding the Fourth Proportional to 2,279.83, 3,146.33 and 1,285.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.83 : 3,146.33 = 1,285.20 : x
2. Step 2: Convert to fraction form
   2,279.83/3,146.33 = 1,285.20/x
3. Step 3: Cross multiply
   2,279.83x = 3,146.33 × 1,285.20
4. Step 4: Simplify right side
   2,279.83x = 4,043,663.32
5. Step 5: Solve for x
   x = 4,043,663.32/2,279.83
6. Step 6: Final answer
   x = 1,773.67