Finding the Fourth Proportional to 21,147.21, 31,718.39 and 7,106.67

Step by Step Solution

1. Step 1: Write the proportion equation
   21,147.21 : 31,718.39 = 7,106.67 : x
2. Step 2: Convert to fraction form
   21,147.21/31,718.39 = 7,106.67/x
3. Step 3: Cross multiply
   21,147.21x = 31,718.39 × 7,106.67
4. Step 4: Simplify right side
   21,147.21x = 225,412,095.13
5. Step 5: Solve for x
   x = 225,412,095.13/21,147.21
6. Step 6: Final answer
   x = 10,659.19