Finding the Fourth Proportional to 30,967.36, 42,734.71 and 16,820.30

Step by Step Solution

1. Step 1: Write the proportion equation
   30,967.36 : 42,734.71 = 16,820.30 : x
2. Step 2: Convert to fraction form
   30,967.36/42,734.71 = 16,820.30/x
3. Step 3: Cross multiply
   30,967.36x = 42,734.71 × 16,820.30
4. Step 4: Simplify right side
   30,967.36x = 718,810,642.61
5. Step 5: Solve for x
   x = 718,810,642.61/30,967.36
6. Step 6: Final answer
   x = 23,211.88