Finding the Fourth Proportional to 2,611.74, 3,918.33 and 880.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.74 : 3,918.33 = 880.38 : x
2. Step 2: Convert to fraction form
   2,611.74/3,918.33 = 880.38/x
3. Step 3: Cross multiply
   2,611.74x = 3,918.33 × 880.38
4. Step 4: Simplify right side
   2,611.74x = 3,449,619.37
5. Step 5: Solve for x
   x = 3,449,619.37/2,611.74
6. Step 6: Final answer
   x = 1,320.81