Finding the Fourth Proportional to 21,212.72, 31,819.60 and 5,630.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,212.72 : 31,819.60 = 5,630.32 : x
2. Step 2: Convert to fraction form
   21,212.72/31,819.60 = 5,630.32/x
3. Step 3: Cross multiply
   21,212.72x = 31,819.60 × 5,630.32
4. Step 4: Simplify right side
   21,212.72x = 179,154,530.27
5. Step 5: Solve for x
   x = 179,154,530.27/21,212.72
6. Step 6: Final answer
   x = 8,445.62