Finding the Fourth Proportional to 21,106.23, 31,665.10 and 7,068.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,106.23 : 31,665.10 = 7,068.57 : x
2. Step 2: Convert to fraction form
   21,106.23/31,665.10 = 7,068.57/x
3. Step 3: Cross multiply
   21,106.23x = 31,665.10 × 7,068.57
4. Step 4: Simplify right side
   21,106.23x = 223,826,975.91
5. Step 5: Solve for x
   x = 223,826,975.91/21,106.23
6. Step 6: Final answer
   x = 10,604.78