Finding the Fourth Proportional to 2,556.21, 3,834.24 and 912.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.21 : 3,834.24 = 912.62 : x
2. Step 2: Convert to fraction form
   2,556.21/3,834.24 = 912.62/x
3. Step 3: Cross multiply
   2,556.21x = 3,834.24 × 912.62
4. Step 4: Simplify right side
   2,556.21x = 3,499,188.70
5. Step 5: Solve for x
   x = 3,499,188.70/2,556.21
6. Step 6: Final answer
   x = 1,368.90