Finding the Fourth Proportional to 20,791.04, 31,186.76 and 5,208.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,791.04 : 31,186.76 = 5,208.72 : x
2. Step 2: Convert to fraction form
   20,791.04/31,186.76 = 5,208.72/x
3. Step 3: Cross multiply
   20,791.04x = 31,186.76 × 5,208.72
4. Step 4: Simplify right side
   20,791.04x = 162,443,100.55
5. Step 5: Solve for x
   x = 162,443,100.55/20,791.04
6. Step 6: Final answer
   x = 7,813.13