Finding the Fourth Proportional to 3,908.89, 5,392.60 and 2,492.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,908.89 : 5,392.60 = 2,492.20 : x
2. Step 2: Convert to fraction form
   3,908.89/5,392.60 = 2,492.20/x
3. Step 3: Cross multiply
   3,908.89x = 5,392.60 × 2,492.20
4. Step 4: Simplify right side
   3,908.89x = 13,439,437.72
5. Step 5: Solve for x
   x = 13,439,437.72/3,908.89
6. Step 6: Final answer
   x = 3,438.17