Finding the Fourth Proportional to 3,100.94, 4,651.55 and 992.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,100.94 : 4,651.55 = 992.78 : x
2. Step 2: Convert to fraction form
   3,100.94/4,651.55 = 992.78/x
3. Step 3: Cross multiply
   3,100.94x = 4,651.55 × 992.78
4. Step 4: Simplify right side
   3,100.94x = 4,617,960.85
5. Step 5: Solve for x
   x = 4,617,960.85/3,100.94
6. Step 6: Final answer
   x = 1,489.21