Finding the Fourth Proportional to 30,938.30, 42,694.82 and 16,791.15

Step by Step Solution

1. Step 1: Write the proportion equation
   30,938.30 : 42,694.82 = 16,791.15 : x
2. Step 2: Convert to fraction form
   30,938.30/42,694.82 = 16,791.15/x
3. Step 3: Cross multiply
   30,938.30x = 42,694.82 × 16,791.15
4. Step 4: Simplify right side
   30,938.30x = 716,895,126.84
5. Step 5: Solve for x
   x = 716,895,126.84/30,938.30
6. Step 6: Final answer
   x = 23,171.77