Finding the Fourth Proportional to 21,812.58, 30,101.50 and 12,381.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,812.58 : 30,101.50 = 12,381.30 : x
2. Step 2: Convert to fraction form
   21,812.58/30,101.50 = 12,381.30/x
3. Step 3: Cross multiply
   21,812.58x = 30,101.50 × 12,381.30
4. Step 4: Simplify right side
   21,812.58x = 372,695,520.49
5. Step 5: Solve for x
   x = 372,695,520.49/21,812.58
6. Step 6: Final answer
   x = 17,086.27