Finding the Fourth Proportional to 20,941.35, 31,174.55 and 20,830.47

Step by Step Solution

1. Step 1: Write the proportion equation
   20,941.35 : 31,174.55 = 20,830.47 : x
2. Step 2: Convert to fraction form
   20,941.35/31,174.55 = 20,830.47/x
3. Step 3: Cross multiply
   20,941.35x = 31,174.55 × 20,830.47
4. Step 4: Simplify right side
   20,941.35x = 649,380,424.39
5. Step 5: Solve for x
   x = 649,380,424.39/20,941.35
6. Step 6: Final answer
   x = 31,009.48