Finding the Fourth Proportional to 3,131.78, 4,321.42 and 1,734.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.78 : 4,321.42 = 1,734.62 : x
2. Step 2: Convert to fraction form
   3,131.78/4,321.42 = 1,734.62/x
3. Step 3: Cross multiply
   3,131.78x = 4,321.42 × 1,734.62
4. Step 4: Simplify right side
   3,131.78x = 7,496,021.56
5. Step 5: Solve for x
   x = 7,496,021.56/3,131.78
6. Step 6: Final answer
   x = 2,393.53