Finding the Fourth Proportional to 22,200.63, 30,638.31 and 12,768.99

Step by Step Solution

1. Step 1: Write the proportion equation
   22,200.63 : 30,638.31 = 12,768.99 : x
2. Step 2: Convert to fraction form
   22,200.63/30,638.31 = 12,768.99/x
3. Step 3: Cross multiply
   22,200.63x = 30,638.31 × 12,768.99
4. Step 4: Simplify right side
   22,200.63x = 391,220,274.01
5. Step 5: Solve for x
   x = 391,220,274.01/22,200.63
6. Step 6: Final answer
   x = 17,622.03