Finding the Fourth Proportional to 21,245.00, 31,871.30 and 8,758.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,245.00 : 31,871.30 = 8,758.08 : x
2. Step 2: Convert to fraction form
   21,245.00/31,871.30 = 8,758.08/x
3. Step 3: Cross multiply
   21,245.00x = 31,871.30 × 8,758.08
4. Step 4: Simplify right side
   21,245.00x = 279,131,351.31
5. Step 5: Solve for x
   x = 279,131,351.31/21,245.00
6. Step 6: Final answer
   x = 13,138.69