Finding the Fourth Proportional to 2,490.96, 3,439.60 and 1,559.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,490.96 : 3,439.60 = 1,559.76 : x
2. Step 2: Convert to fraction form
   2,490.96/3,439.60 = 1,559.76/x
3. Step 3: Cross multiply
   2,490.96x = 3,439.60 × 1,559.76
4. Step 4: Simplify right side
   2,490.96x = 5,364,950.50
5. Step 5: Solve for x
   x = 5,364,950.50/2,490.96
6. Step 6: Final answer
   x = 2,153.77