Finding the Fourth Proportional to 30,969.33, 42,735.56 and 16,821.87

Step by Step Solution

1. Step 1: Write the proportion equation
   30,969.33 : 42,735.56 = 16,821.87 : x
2. Step 2: Convert to fraction form
   30,969.33/42,735.56 = 16,821.87/x
3. Step 3: Cross multiply
   30,969.33x = 42,735.56 × 16,821.87
4. Step 4: Simplify right side
   30,969.33x = 718,892,034.70
5. Step 5: Solve for x
   x = 718,892,034.70/30,969.33
6. Step 6: Final answer
   x = 23,213.03