Finding the Fourth Proportional to 3,111.49, 4,666.72 and 919.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.49 : 4,666.72 = 919.71 : x
2. Step 2: Convert to fraction form
   3,111.49/4,666.72 = 919.71/x
3. Step 3: Cross multiply
   3,111.49x = 4,666.72 × 919.71
4. Step 4: Simplify right side
   3,111.49x = 4,292,029.05
5. Step 5: Solve for x
   x = 4,292,029.05/3,111.49
6. Step 6: Final answer
   x = 1,379.41