Finding the Fourth Proportional to 12,678.83, 19,019.97 and 5,281.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.83 : 19,019.97 = 5,281.56 : x
2. Step 2: Convert to fraction form
   12,678.83/19,019.97 = 5,281.56/x
3. Step 3: Cross multiply
   12,678.83x = 19,019.97 × 5,281.56
4. Step 4: Simplify right side
   12,678.83x = 100,455,112.00
5. Step 5: Solve for x
   x = 100,455,112.00/12,678.83
6. Step 6: Final answer
   x = 7,923.06