Finding the Fourth Proportional to 2,490.69, 3,435.72 and 1,557.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,490.69 : 3,435.72 = 1,557.57 : x
2. Step 2: Convert to fraction form
   2,490.69/3,435.72 = 1,557.57/x
3. Step 3: Cross multiply
   2,490.69x = 3,435.72 × 1,557.57
4. Step 4: Simplify right side
   2,490.69x = 5,351,374.40
5. Step 5: Solve for x
   x = 5,351,374.40/2,490.69
6. Step 6: Final answer
   x = 2,148.55