Finding the Fourth Proportional to 2,659.79, 3,989.95 and 1,017.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.79 : 3,989.95 = 1,017.72 : x
2. Step 2: Convert to fraction form
   2,659.79/3,989.95 = 1,017.72/x
3. Step 3: Cross multiply
   2,659.79x = 3,989.95 × 1,017.72
4. Step 4: Simplify right side
   2,659.79x = 4,060,651.91
5. Step 5: Solve for x
   x = 4,060,651.91/2,659.79
6. Step 6: Final answer
   x = 1,526.68