Finding the Fourth Proportional to 2,611.71, 3,917.84 and 880.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.71 : 3,917.84 = 880.34 : x
2. Step 2: Convert to fraction form
   2,611.71/3,917.84 = 880.34/x
3. Step 3: Cross multiply
   2,611.71x = 3,917.84 × 880.34
4. Step 4: Simplify right side
   2,611.71x = 3,449,007.27
5. Step 5: Solve for x
   x = 3,449,007.27/2,611.71
6. Step 6: Final answer
   x = 1,320.59