Finding the Fourth Proportional to 12,426.15, 18,628.69 and 5,400.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,426.15 : 18,628.69 = 5,400.88 : x
2. Step 2: Convert to fraction form
   12,426.15/18,628.69 = 5,400.88/x
3. Step 3: Cross multiply
   12,426.15x = 18,628.69 × 5,400.88
4. Step 4: Simplify right side
   12,426.15x = 100,611,319.25
5. Step 5: Solve for x
   x = 100,611,319.25/12,426.15
6. Step 6: Final answer
   x = 8,096.74