Finding the Fourth Proportional to 21,108.78, 31,667.25 and 6,316.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,108.78 : 31,667.25 = 6,316.42 : x
2. Step 2: Convert to fraction form
   21,108.78/31,667.25 = 6,316.42/x
3. Step 3: Cross multiply
   21,108.78x = 31,667.25 × 6,316.42
4. Step 4: Simplify right side
   21,108.78x = 200,023,651.25
5. Step 5: Solve for x
   x = 200,023,651.25/21,108.78
6. Step 6: Final answer
   x = 9,475.85