Finding the Fourth Proportional to 3,967.31, 5,474.79 and 2,288.70

Step by Step Solution

1. Step 1: Write the proportion equation
   3,967.31 : 5,474.79 = 2,288.70 : x
2. Step 2: Convert to fraction form
   3,967.31/5,474.79 = 2,288.70/x
3. Step 3: Cross multiply
   3,967.31x = 5,474.79 × 2,288.70
4. Step 4: Simplify right side
   3,967.31x = 12,530,151.87
5. Step 5: Solve for x
   x = 12,530,151.87/3,967.31
6. Step 6: Final answer
   x = 3,158.35