Finding the Fourth Proportional to 2,658.61, 3,988.52 and 1,015.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.61 : 3,988.52 = 1,015.12 : x
2. Step 2: Convert to fraction form
   2,658.61/3,988.52 = 1,015.12/x
3. Step 3: Cross multiply
   2,658.61x = 3,988.52 × 1,015.12
4. Step 4: Simplify right side
   2,658.61x = 4,048,826.42
5. Step 5: Solve for x
   x = 4,048,826.42/2,658.61
6. Step 6: Final answer
   x = 1,522.91