Finding the Fourth Proportional to 21,192.96, 31,791.60 and 7,338.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,192.96 : 31,791.60 = 7,338.72 : x
2. Step 2: Convert to fraction form
   21,192.96/31,791.60 = 7,338.72/x
3. Step 3: Cross multiply
   21,192.96x = 31,791.60 × 7,338.72
4. Step 4: Simplify right side
   21,192.96x = 233,309,650.75
5. Step 5: Solve for x
   x = 233,309,650.75/21,192.96
6. Step 6: Final answer
   x = 11,008.83