Finding the Fourth Proportional to 21,106.57, 31,661.30 and 7,066.03

Step by Step Solution

1. Step 1: Write the proportion equation
   21,106.57 : 31,661.30 = 7,066.03 : x
2. Step 2: Convert to fraction form
   21,106.57/31,661.30 = 7,066.03/x
3. Step 3: Cross multiply
   21,106.57x = 31,661.30 × 7,066.03
4. Step 4: Simplify right side
   21,106.57x = 223,719,695.64
5. Step 5: Solve for x
   x = 223,719,695.64/21,106.57
6. Step 6: Final answer
   x = 10,599.53