Finding the Fourth Proportional to 12,381.98, 18,528.60 and 10,721.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,381.98 : 18,528.60 = 10,721.83 : x
2. Step 2: Convert to fraction form
   12,381.98/18,528.60 = 10,721.83/x
3. Step 3: Cross multiply
   12,381.98x = 18,528.60 × 10,721.83
4. Step 4: Simplify right side
   12,381.98x = 198,660,499.34
5. Step 5: Solve for x
   x = 198,660,499.34/12,381.98
6. Step 6: Final answer
   x = 16,044.32