Finding the Fourth Proportional to 21,193.94, 31,796.45 and 12,300.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,193.94 : 31,796.45 = 12,300.72 : x
2. Step 2: Convert to fraction form
   21,193.94/31,796.45 = 12,300.72/x
3. Step 3: Cross multiply
   21,193.94x = 31,796.45 × 12,300.72
4. Step 4: Simplify right side
   21,193.94x = 391,119,166.94
5. Step 5: Solve for x
   x = 391,119,166.94/21,193.94
6. Step 6: Final answer
   x = 18,454.29