Finding the Fourth Proportional to 30,986.34, 42,761.61 and 16,839.20

Step by Step Solution

1. Step 1: Write the proportion equation
   30,986.34 : 42,761.61 = 16,839.20 : x
2. Step 2: Convert to fraction form
   30,986.34/42,761.61 = 16,839.20/x
3. Step 3: Cross multiply
   30,986.34x = 42,761.61 × 16,839.20
4. Step 4: Simplify right side
   30,986.34x = 720,071,089.30
5. Step 5: Solve for x
   x = 720,071,089.30/30,986.34
6. Step 6: Final answer
   x = 23,238.34