Finding the Fourth Proportional to 21,148.59, 31,716.72 and 7,107.03

Step by Step Solution

1. Step 1: Write the proportion equation
   21,148.59 : 31,716.72 = 7,107.03 : x
2. Step 2: Convert to fraction form
   21,148.59/31,716.72 = 7,107.03/x
3. Step 3: Cross multiply
   21,148.59x = 31,716.72 × 7,107.03
4. Step 4: Simplify right side
   21,148.59x = 225,411,680.54
5. Step 5: Solve for x
   x = 225,411,680.54/21,148.59
6. Step 6: Final answer
   x = 10,658.47