Finding the Fourth Proportional to 20,796.78, 31,209.69 and 9,113.34

Step by Step Solution

1. Step 1: Write the proportion equation
   20,796.78 : 31,209.69 = 9,113.34 : x
2. Step 2: Convert to fraction form
   20,796.78/31,209.69 = 9,113.34/x
3. Step 3: Cross multiply
   20,796.78x = 31,209.69 × 9,113.34
4. Step 4: Simplify right side
   20,796.78x = 284,424,516.26
5. Step 5: Solve for x
   x = 284,424,516.26/20,796.78
6. Step 6: Final answer
   x = 13,676.37