Finding the Fourth Proportional to 3,928.06, 5,420.61 and 2,531.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,928.06 : 5,420.61 = 2,531.62 : x
2. Step 2: Convert to fraction form
   3,928.06/5,420.61 = 2,531.62/x
3. Step 3: Cross multiply
   3,928.06x = 5,420.61 × 2,531.62
4. Step 4: Simplify right side
   3,928.06x = 13,722,924.69
5. Step 5: Solve for x
   x = 13,722,924.69/3,928.06
6. Step 6: Final answer
   x = 3,493.56