Finding the Fourth Proportional to 3,143.86, 4,715.31 and 922.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,143.86 : 4,715.31 = 922.09 : x
2. Step 2: Convert to fraction form
   3,143.86/4,715.31 = 922.09/x
3. Step 3: Cross multiply
   3,143.86x = 4,715.31 × 922.09
4. Step 4: Simplify right side
   3,143.86x = 4,347,940.20
5. Step 5: Solve for x
   x = 4,347,940.20/3,143.86
6. Step 6: Final answer
   x = 1,382.99