Finding the Fourth Proportional to 12,978.92, 19,466.25 and 3,619.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.92 : 19,466.25 = 3,619.58 : x
2. Step 2: Convert to fraction form
   12,978.92/19,466.25 = 3,619.58/x
3. Step 3: Cross multiply
   12,978.92x = 19,466.25 × 3,619.58
4. Step 4: Simplify right side
   12,978.92x = 70,459,551.84
5. Step 5: Solve for x
   x = 70,459,551.84/12,978.92
6. Step 6: Final answer
   x = 5,428.77