Finding the Fourth Proportional to 21,819.18, 30,113.30 and 13,319.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.18 : 30,113.30 = 13,319.53 : x
2. Step 2: Convert to fraction form
   21,819.18/30,113.30 = 13,319.53/x
3. Step 3: Cross multiply
   21,819.18x = 30,113.30 × 13,319.53
4. Step 4: Simplify right side
   21,819.18x = 401,094,960.76
5. Step 5: Solve for x
   x = 401,094,960.76/21,819.18
6. Step 6: Final answer
   x = 18,382.67