Finding the Fourth Proportional to 22,678.36, 31,298.28 and 13,728.10

Step by Step Solution

1. Step 1: Write the proportion equation
   22,678.36 : 31,298.28 = 13,728.10 : x
2. Step 2: Convert to fraction form
   22,678.36/31,298.28 = 13,728.10/x
3. Step 3: Cross multiply
   22,678.36x = 31,298.28 × 13,728.10
4. Step 4: Simplify right side
   22,678.36x = 429,665,917.67
5. Step 5: Solve for x
   x = 429,665,917.67/22,678.36
6. Step 6: Final answer
   x = 18,946.08