Finding the Fourth Proportional to 21,106.86, 31,667.88 and 9,872.24

Step by Step Solution

1. Step 1: Write the proportion equation
   21,106.86 : 31,667.88 = 9,872.24 : x
2. Step 2: Convert to fraction form
   21,106.86/31,667.88 = 9,872.24/x
3. Step 3: Cross multiply
   21,106.86x = 31,667.88 × 9,872.24
4. Step 4: Simplify right side
   21,106.86x = 312,632,911.65
5. Step 5: Solve for x
   x = 312,632,911.65/21,106.86
6. Step 6: Final answer
   x = 14,811.91