Finding the Fourth Proportional to 3,654.42, 5,481.72 and 2,190.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,654.42 : 5,481.72 = 2,190.30 : x
2. Step 2: Convert to fraction form
   3,654.42/5,481.72 = 2,190.30/x
3. Step 3: Cross multiply
   3,654.42x = 5,481.72 × 2,190.30
4. Step 4: Simplify right side
   3,654.42x = 12,006,611.32
5. Step 5: Solve for x
   x = 12,006,611.32/3,654.42
6. Step 6: Final answer
   x = 3,285.50