Finding the Fourth Proportional to 3,111.06, 4,667.51 and 919.85

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.06 : 4,667.51 = 919.85 : x
2. Step 2: Convert to fraction form
   3,111.06/4,667.51 = 919.85/x
3. Step 3: Cross multiply
   3,111.06x = 4,667.51 × 919.85
4. Step 4: Simplify right side
   3,111.06x = 4,293,406.80
5. Step 5: Solve for x
   x = 4,293,406.80/3,111.06
6. Step 6: Final answer
   x = 1,380.04