Finding the Fourth Proportional to 15,500.37, 21,390.72 and 8,426.79

Step by Step Solution

1. Step 1: Write the proportion equation
   15,500.37 : 21,390.72 = 8,426.79 : x
2. Step 2: Convert to fraction form
   15,500.37/21,390.72 = 8,426.79/x
3. Step 3: Cross multiply
   15,500.37x = 21,390.72 × 8,426.79
4. Step 4: Simplify right side
   15,500.37x = 180,255,105.39
5. Step 5: Solve for x
   x = 180,255,105.39/15,500.37
6. Step 6: Final answer
   x = 11,629.08