Finding the Fourth Proportional to 22,384.20, 30,889.69 and 12,312.43

Step by Step Solution

1. Step 1: Write the proportion equation
   22,384.20 : 30,889.69 = 12,312.43 : x
2. Step 2: Convert to fraction form
   22,384.20/30,889.69 = 12,312.43/x
3. Step 3: Cross multiply
   22,384.20x = 30,889.69 × 12,312.43
4. Step 4: Simplify right side
   22,384.20x = 380,327,037.84
5. Step 5: Solve for x
   x = 380,327,037.84/22,384.20
6. Step 6: Final answer
   x = 16,990.87