Finding the Fourth Proportional to 1,344.78, 1,854.78 and 1,285.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,344.78 : 1,854.78 = 1,285.89 : x
2. Step 2: Convert to fraction form
   1,344.78/1,854.78 = 1,285.89/x
3. Step 3: Cross multiply
   1,344.78x = 1,854.78 × 1,285.89
4. Step 4: Simplify right side
   1,344.78x = 2,385,043.05
5. Step 5: Solve for x
   x = 2,385,043.05/1,344.78
6. Step 6: Final answer
   x = 1,773.56