Finding the Fourth Proportional to 3,111.42, 4,665.52 and 919.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.42 : 4,665.52 = 919.88 : x
2. Step 2: Convert to fraction form
   3,111.42/4,665.52 = 919.88/x
3. Step 3: Cross multiply
   3,111.42x = 4,665.52 × 919.88
4. Step 4: Simplify right side
   3,111.42x = 4,291,718.54
5. Step 5: Solve for x
   x = 4,291,718.54/3,111.42
6. Step 6: Final answer
   x = 1,379.34