Finding the Fourth Proportional to 12,357.42, 17,019 and 10,678.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,357.42 : 17,019 = 10,678.28 : x
2. Step 2: Convert to fraction form
   12,357.42/17,019 = 10,678.28/x
3. Step 3: Cross multiply
   12,357.42x = 17,019 × 10,678.28
4. Step 4: Simplify right side
   12,357.42x = 181,733,647.32
5. Step 5: Solve for x
   x = 181,733,647.32/12,357.42
6. Step 6: Final answer
   x = 14,706.44