Finding the Fourth Proportional to 2,543.79, 3,815.56 and 1,490.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.79 : 3,815.56 = 1,490.20 : x
2. Step 2: Convert to fraction form
   2,543.79/3,815.56 = 1,490.20/x
3. Step 3: Cross multiply
   2,543.79x = 3,815.56 × 1,490.20
4. Step 4: Simplify right side
   2,543.79x = 5,685,947.51
5. Step 5: Solve for x
   x = 5,685,947.51/2,543.79
6. Step 6: Final answer
   x = 2,235.23