Finding the Fourth Proportional to 2,490.78, 3,436.52 and 1,442.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,490.78 : 3,436.52 = 1,442.64 : x
2. Step 2: Convert to fraction form
   2,490.78/3,436.52 = 1,442.64/x
3. Step 3: Cross multiply
   2,490.78x = 3,436.52 × 1,442.64
4. Step 4: Simplify right side
   2,490.78x = 4,957,654.00
5. Step 5: Solve for x
   x = 4,957,654.00/2,490.78
6. Step 6: Final answer
   x = 1,990.40