Finding the Fourth Proportional to 21,018.42, 31,533.84 and 8,536.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.42 : 31,533.84 = 8,536.05 : x
2. Step 2: Convert to fraction form
   21,018.42/31,533.84 = 8,536.05/x
3. Step 3: Cross multiply
   21,018.42x = 31,533.84 × 8,536.05
4. Step 4: Simplify right side
   21,018.42x = 269,174,434.93
5. Step 5: Solve for x
   x = 269,174,434.93/21,018.42
6. Step 6: Final answer
   x = 12,806.60