Finding the Fourth Proportional to 13,621.37, 20,426.72 and 5,300.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,621.37 : 20,426.72 = 5,300.28 : x
2. Step 2: Convert to fraction form
   13,621.37/20,426.72 = 5,300.28/x
3. Step 3: Cross multiply
   13,621.37x = 20,426.72 × 5,300.28
4. Step 4: Simplify right side
   13,621.37x = 108,267,308.98
5. Step 5: Solve for x
   x = 108,267,308.98/13,621.37
6. Step 6: Final answer
   x = 7,948.35