Finding the Fourth Proportional to 21,153.34, 31,719.61 and 8,669.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,153.34 : 31,719.61 = 8,669.96 : x
2. Step 2: Convert to fraction form
   21,153.34/31,719.61 = 8,669.96/x
3. Step 3: Cross multiply
   21,153.34x = 31,719.61 × 8,669.96
4. Step 4: Simplify right side
   21,153.34x = 275,007,749.92
5. Step 5: Solve for x
   x = 275,007,749.92/21,153.34
6. Step 6: Final answer
   x = 13,000.68