Finding the Fourth Proportional to 3,890.72, 5,366.16 and 2,493.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,890.72 : 5,366.16 = 2,493.60 : x
2. Step 2: Convert to fraction form
   3,890.72/5,366.16 = 2,493.60/x
3. Step 3: Cross multiply
   3,890.72x = 5,366.16 × 2,493.60
4. Step 4: Simplify right side
   3,890.72x = 13,381,056.58
5. Step 5: Solve for x
   x = 13,381,056.58/3,890.72
6. Step 6: Final answer
   x = 3,439.22