Finding the Fourth Proportional to 30,819.50, 42,530.74 and 16,672.30

Step by Step Solution

1. Step 1: Write the proportion equation
   30,819.50 : 42,530.74 = 16,672.30 : x
2. Step 2: Convert to fraction form
   30,819.50/42,530.74 = 16,672.30/x
3. Step 3: Cross multiply
   30,819.50x = 42,530.74 × 16,672.30
4. Step 4: Simplify right side
   30,819.50x = 709,085,256.50
5. Step 5: Solve for x
   x = 709,085,256.50/30,819.50
6. Step 6: Final answer
   x = 23,007.68