Finding the Fourth Proportional to 2,658.88, 3,989.00 and 1,015.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.88 : 3,989.00 = 1,015.89 : x
2. Step 2: Convert to fraction form
   2,658.88/3,989.00 = 1,015.89/x
3. Step 3: Cross multiply
   2,658.88x = 3,989.00 × 1,015.89
4. Step 4: Simplify right side
   2,658.88x = 4,052,389.51
5. Step 5: Solve for x
   x = 4,052,389.51/2,658.88
6. Step 6: Final answer
   x = 1,524.10