Finding the Fourth Proportional to 2,661.60, 3,992.16 and 1,017.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.60 : 3,992.16 = 1,017.12 : x
2. Step 2: Convert to fraction form
   2,661.60/3,992.16 = 1,017.12/x
3. Step 3: Cross multiply
   2,661.60x = 3,992.16 × 1,017.12
4. Step 4: Simplify right side
   2,661.60x = 4,060,505.78
5. Step 5: Solve for x
   x = 4,060,505.78/2,661.60
6. Step 6: Final answer
   x = 1,525.59