Finding the Fourth Proportional to 3,007.31, 4,507.34 and 2,128.46

Step by Step Solution

1. Step 1: Write the proportion equation
   3,007.31 : 4,507.34 = 2,128.46 : x
2. Step 2: Convert to fraction form
   3,007.31/4,507.34 = 2,128.46/x
3. Step 3: Cross multiply
   3,007.31x = 4,507.34 × 2,128.46
4. Step 4: Simplify right side
   3,007.31x = 9,593,659.72
5. Step 5: Solve for x
   x = 9,593,659.72/3,007.31
6. Step 6: Final answer
   x = 3,190.12