Finding the Fourth Proportional to 31,789.57, 47,678.96 and 8,418.37

Step by Step Solution

1. Step 1: Write the proportion equation
   31,789.57 : 47,678.96 = 8,418.37 : x
2. Step 2: Convert to fraction form
   31,789.57/47,678.96 = 8,418.37/x
3. Step 3: Cross multiply
   31,789.57x = 47,678.96 × 8,418.37
4. Step 4: Simplify right side
   31,789.57x = 401,379,084.40
5. Step 5: Solve for x
   x = 401,379,084.40/31,789.57
6. Step 6: Final answer
   x = 12,626.12