Finding the Fourth Proportional to 21,209.34, 31,811.58 and 5,628.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,209.34 : 31,811.58 = 5,628.18 : x
2. Step 2: Convert to fraction form
   21,209.34/31,811.58 = 5,628.18/x
3. Step 3: Cross multiply
   21,209.34x = 31,811.58 × 5,628.18
4. Step 4: Simplify right side
   21,209.34x = 179,041,298.32
5. Step 5: Solve for x
   x = 179,041,298.32/21,209.34
6. Step 6: Final answer
   x = 8,441.63