Finding the Fourth Proportional to 2,648.39, 3,971.66 and 1,087.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.39 : 3,971.66 = 1,087.94 : x
2. Step 2: Convert to fraction form
   2,648.39/3,971.66 = 1,087.94/x
3. Step 3: Cross multiply
   2,648.39x = 3,971.66 × 1,087.94
4. Step 4: Simplify right side
   2,648.39x = 4,320,932.27
5. Step 5: Solve for x
   x = 4,320,932.27/2,648.39
6. Step 6: Final answer
   x = 1,631.53