Finding the Fourth Proportional to 3,141.20, 4,710.69 and 919.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,141.20 : 4,710.69 = 919.42 : x
2. Step 2: Convert to fraction form
   3,141.20/4,710.69 = 919.42/x
3. Step 3: Cross multiply
   3,141.20x = 4,710.69 × 919.42
4. Step 4: Simplify right side
   3,141.20x = 4,331,090.82
5. Step 5: Solve for x
   x = 4,331,090.82/3,141.20
6. Step 6: Final answer
   x = 1,378.80