Finding the Fourth Proportional to 2,389.72, 3,584.48 and 658.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.72 : 3,584.48 = 658.30 : x
2. Step 2: Convert to fraction form
   2,389.72/3,584.48 = 658.30/x
3. Step 3: Cross multiply
   2,389.72x = 3,584.48 × 658.30
4. Step 4: Simplify right side
   2,389.72x = 2,359,646.91
5. Step 5: Solve for x
   x = 2,359,646.91/2,389.72
6. Step 6: Final answer
   x = 987.42