Finding the Fourth Proportional to 3,112.63, 4,667.73 and 920.77

Step by Step Solution

1. Step 1: Write the proportion equation
   3,112.63 : 4,667.73 = 920.77 : x
2. Step 2: Convert to fraction form
   3,112.63/4,667.73 = 920.77/x
3. Step 3: Cross multiply
   3,112.63x = 4,667.73 × 920.77
4. Step 4: Simplify right side
   3,112.63x = 4,297,890.63
5. Step 5: Solve for x
   x = 4,297,890.63/3,112.63
6. Step 6: Final answer
   x = 1,380.79