Finding the Fourth Proportional to 2,627.54, 3,940.32 and 872.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,627.54 : 3,940.32 = 872.21 : x
2. Step 2: Convert to fraction form
   2,627.54/3,940.32 = 872.21/x
3. Step 3: Cross multiply
   2,627.54x = 3,940.32 × 872.21
4. Step 4: Simplify right side
   2,627.54x = 3,436,786.51
5. Step 5: Solve for x
   x = 3,436,786.51/2,627.54
6. Step 6: Final answer
   x = 1,307.99