Finding the Fourth Proportional to 2,285.06, 3,153.38 and 1,290.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,285.06 : 3,153.38 = 1,290.29 : x
2. Step 2: Convert to fraction form
   2,285.06/3,153.38 = 1,290.29/x
3. Step 3: Cross multiply
   2,285.06x = 3,153.38 × 1,290.29
4. Step 4: Simplify right side
   2,285.06x = 4,068,752.46
5. Step 5: Solve for x
   x = 4,068,752.46/2,285.06
6. Step 6: Final answer
   x = 1,780.59