Finding the Fourth Proportional to 15,500.15, 21,390.24 and 8,426.42

Step by Step Solution

1. Step 1: Write the proportion equation
   15,500.15 : 21,390.24 = 8,426.42 : x
2. Step 2: Convert to fraction form
   15,500.15/21,390.24 = 8,426.42/x
3. Step 3: Cross multiply
   15,500.15x = 21,390.24 × 8,426.42
4. Step 4: Simplify right side
   15,500.15x = 180,243,146.14
5. Step 5: Solve for x
   x = 180,243,146.14/15,500.15
6. Step 6: Final answer
   x = 11,628.48