Finding the Fourth Proportional to 21,235.48, 31,857.25 and 7,004.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,235.48 : 31,857.25 = 7,004.78 : x
2. Step 2: Convert to fraction form
   21,235.48/31,857.25 = 7,004.78/x
3. Step 3: Cross multiply
   21,235.48x = 31,857.25 × 7,004.78
4. Step 4: Simplify right side
   21,235.48x = 223,152,850.86
5. Step 5: Solve for x
   x = 223,152,850.86/21,235.48
6. Step 6: Final answer
   x = 10,508.49