Finding the Fourth Proportional to 2,285.49, 3,153.80 and 1,290.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,285.49 : 3,153.80 = 1,290.86 : x
2. Step 2: Convert to fraction form
   2,285.49/3,153.80 = 1,290.86/x
3. Step 3: Cross multiply
   2,285.49x = 3,153.80 × 1,290.86
4. Step 4: Simplify right side
   2,285.49x = 4,071,114.27
5. Step 5: Solve for x
   x = 4,071,114.27/2,285.49
6. Step 6: Final answer
   x = 1,781.29