Finding the Fourth Proportional to 30,909, 42,654.42 and 16,761.86

Step by Step Solution

1. Step 1: Write the proportion equation
   30,909 : 42,654.42 = 16,761.86 : x
2. Step 2: Convert to fraction form
   30,909/42,654.42 = 16,761.86/x
3. Step 3: Cross multiply
   30,909x = 42,654.42 × 16,761.86
4. Step 4: Simplify right side
   30,909x = 714,967,203.15
5. Step 5: Solve for x
   x = 714,967,203.15/30,909
6. Step 6: Final answer
   x = 23,131.36