Finding the Fourth Proportional to 2,659.47, 3,989.53 and 880.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.47 : 3,989.53 = 880.59 : x
2. Step 2: Convert to fraction form
   2,659.47/3,989.53 = 880.59/x
3. Step 3: Cross multiply
   2,659.47x = 3,989.53 × 880.59
4. Step 4: Simplify right side
   2,659.47x = 3,513,135.82
5. Step 5: Solve for x
   x = 3,513,135.82/2,659.47
6. Step 6: Final answer
   x = 1,320.99