Finding the Fourth Proportional to 2,556.88, 3,835.68 and 1,386.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.88 : 3,835.68 = 1,386.48 : x
2. Step 2: Convert to fraction form
   2,556.88/3,835.68 = 1,386.48/x
3. Step 3: Cross multiply
   2,556.88x = 3,835.68 × 1,386.48
4. Step 4: Simplify right side
   2,556.88x = 5,318,093.61
5. Step 5: Solve for x
   x = 5,318,093.61/2,556.88
6. Step 6: Final answer
   x = 2,079.92