Finding the Fourth Proportional to 12,978.48, 19,468.49 and 3,618.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.48 : 19,468.49 = 3,618.29 : x
2. Step 2: Convert to fraction form
   12,978.48/19,468.49 = 3,618.29/x
3. Step 3: Cross multiply
   12,978.48x = 19,468.49 × 3,618.29
4. Step 4: Simplify right side
   12,978.48x = 70,442,608.63
5. Step 5: Solve for x
   x = 70,442,608.63/12,978.48
6. Step 6: Final answer
   x = 5,427.65