Finding the Fourth Proportional to 30,963.98, 42,743.36 and 20,906.04

Step by Step Solution

1. Step 1: Write the proportion equation
   30,963.98 : 42,743.36 = 20,906.04 : x
2. Step 2: Convert to fraction form
   30,963.98/42,743.36 = 20,906.04/x
3. Step 3: Cross multiply
   30,963.98x = 42,743.36 × 20,906.04
4. Step 4: Simplify right side
   30,963.98x = 893,594,393.89
5. Step 5: Solve for x
   x = 893,594,393.89/30,963.98
6. Step 6: Final answer
   x = 28,859.16