Finding the Fourth Proportional to 28,958.34, 39,964.41 and 16,212.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,958.34 : 39,964.41 = 16,212.72 : x
2. Step 2: Convert to fraction form
   28,958.34/39,964.41 = 16,212.72/x
3. Step 3: Cross multiply
   28,958.34x = 39,964.41 × 16,212.72
4. Step 4: Simplify right side
   28,958.34x = 647,931,789.30
5. Step 5: Solve for x
   x = 647,931,789.30/28,958.34
6. Step 6: Final answer
   x = 22,374.62