Finding the Fourth Proportional to 3,330.72, 4,990.82 and 2,158.65

Step by Step Solution

1. Step 1: Write the proportion equation
   3,330.72 : 4,990.82 = 2,158.65 : x
2. Step 2: Convert to fraction form
   3,330.72/4,990.82 = 2,158.65/x
3. Step 3: Cross multiply
   3,330.72x = 4,990.82 × 2,158.65
4. Step 4: Simplify right side
   3,330.72x = 10,773,422.80
5. Step 5: Solve for x
   x = 10,773,422.80/3,330.72
6. Step 6: Final answer
   x = 3,234.56