Finding the Fourth Proportional to 21,300.47, 31,950.82 and 8,813.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.47 : 31,950.82 = 8,813.72 : x
2. Step 2: Convert to fraction form
   21,300.47/31,950.82 = 8,813.72/x
3. Step 3: Cross multiply
   21,300.47x = 31,950.82 × 8,813.72
4. Step 4: Simplify right side
   21,300.47x = 281,605,581.25
5. Step 5: Solve for x
   x = 281,605,581.25/21,300.47
6. Step 6: Final answer
   x = 13,220.63