Finding the Fourth Proportional to 20,808.72, 31,198.49 and 7,659.38

Step by Step Solution

1. Step 1: Write the proportion equation
   20,808.72 : 31,198.49 = 7,659.38 : x
2. Step 2: Convert to fraction form
   20,808.72/31,198.49 = 7,659.38/x
3. Step 3: Cross multiply
   20,808.72x = 31,198.49 × 7,659.38
4. Step 4: Simplify right side
   20,808.72x = 238,961,090.34
5. Step 5: Solve for x
   x = 238,961,090.34/20,808.72
6. Step 6: Final answer
   x = 11,483.70