Finding the Fourth Proportional to 3,887.20, 5,362.96 and 2,490.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,887.20 : 5,362.96 = 2,490.72 : x
2. Step 2: Convert to fraction form
   3,887.20/5,362.96 = 2,490.72/x
3. Step 3: Cross multiply
   3,887.20x = 5,362.96 × 2,490.72
4. Step 4: Simplify right side
   3,887.20x = 13,357,631.73
5. Step 5: Solve for x
   x = 13,357,631.73/3,887.20
6. Step 6: Final answer
   x = 3,436.31