Finding the Fourth Proportional to 30,967.50, 42,734.30 and 16,820.35

Step by Step Solution

1. Step 1: Write the proportion equation
   30,967.50 : 42,734.30 = 16,820.35 : x
2. Step 2: Convert to fraction form
   30,967.50/42,734.30 = 16,820.35/x
3. Step 3: Cross multiply
   30,967.50x = 42,734.30 × 16,820.35
4. Step 4: Simplify right side
   30,967.50x = 718,805,883.01
5. Step 5: Solve for x
   x = 718,805,883.01/30,967.50
6. Step 6: Final answer
   x = 23,211.62