Finding the Fourth Proportional to 2,661.64, 3,989.72 and 1,017.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.64 : 3,989.72 = 1,017.74 : x
2. Step 2: Convert to fraction form
   2,661.64/3,989.72 = 1,017.74/x
3. Step 3: Cross multiply
   2,661.64x = 3,989.72 × 1,017.74
4. Step 4: Simplify right side
   2,661.64x = 4,060,497.63
5. Step 5: Solve for x
   x = 4,060,497.63/2,661.64
6. Step 6: Final answer
   x = 1,525.56