Finding the Fourth Proportional to 21,300.74, 31,954.91 and 8,813.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.74 : 31,954.91 = 8,813.98 : x
2. Step 2: Convert to fraction form
   21,300.74/31,954.91 = 8,813.98/x
3. Step 3: Cross multiply
   21,300.74x = 31,954.91 × 8,813.98
4. Step 4: Simplify right side
   21,300.74x = 281,649,933.52
5. Step 5: Solve for x
   x = 281,649,933.52/21,300.74
6. Step 6: Final answer
   x = 13,222.54