Finding the Fourth Proportional to 12,858.78, 19,288.56 and 3,624.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,858.78 : 19,288.56 = 3,624.78 : x
2. Step 2: Convert to fraction form
   12,858.78/19,288.56 = 3,624.78/x
3. Step 3: Cross multiply
   12,858.78x = 19,288.56 × 3,624.78
4. Step 4: Simplify right side
   12,858.78x = 69,916,786.52
5. Step 5: Solve for x
   x = 69,916,786.52/12,858.78
6. Step 6: Final answer
   x = 5,437.28