Finding the Fourth Proportional to 2,611.51, 3,917.54 and 880.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.51 : 3,917.54 = 880.27 : x
2. Step 2: Convert to fraction form
   2,611.51/3,917.54 = 880.27/x
3. Step 3: Cross multiply
   2,611.51x = 3,917.54 × 880.27
4. Step 4: Simplify right side
   2,611.51x = 3,448,492.94
5. Step 5: Solve for x
   x = 3,448,492.94/2,611.51
6. Step 6: Final answer
   x = 1,320.50