Finding the Fourth Proportional to 2,660.47, 3,991.71 and 1,017.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.47 : 3,991.71 = 1,017.38 : x
2. Step 2: Convert to fraction form
   2,660.47/3,991.71 = 1,017.38/x
3. Step 3: Cross multiply
   2,660.47x = 3,991.71 × 1,017.38
4. Step 4: Simplify right side
   2,660.47x = 4,061,085.92
5. Step 5: Solve for x
   x = 4,061,085.92/2,660.47
6. Step 6: Final answer
   x = 1,526.45