Finding the Fourth Proportional to 1,462.14, 2,193.89 and 640.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,462.14 : 2,193.89 = 640.31 : x
2. Step 2: Convert to fraction form
   1,462.14/2,193.89 = 640.31/x
3. Step 3: Cross multiply
   1,462.14x = 2,193.89 × 640.31
4. Step 4: Simplify right side
   1,462.14x = 1,404,760.34
5. Step 5: Solve for x
   x = 1,404,760.34/1,462.14
6. Step 6: Final answer
   x = 960.76