Finding the Fourth Proportional to 22,271.10, 30,736.71 and 12,840

Step by Step Solution

1. Step 1: Write the proportion equation
   22,271.10 : 30,736.71 = 12,840 : x
2. Step 2: Convert to fraction form
   22,271.10/30,736.71 = 12,840/x
3. Step 3: Cross multiply
   22,271.10x = 30,736.71 × 12,840
4. Step 4: Simplify right side
   22,271.10x = 394,659,356.40
5. Step 5: Solve for x
   x = 394,659,356.40/22,271.10
6. Step 6: Final answer
   x = 17,720.69