Finding the Fourth Proportional to 12,978.17, 19,465.12 and 3,618.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.17 : 19,465.12 = 3,618.82 : x
2. Step 2: Convert to fraction form
   12,978.17/19,465.12 = 3,618.82/x
3. Step 3: Cross multiply
   12,978.17x = 19,465.12 × 3,618.82
4. Step 4: Simplify right side
   12,978.17x = 70,440,707.85
5. Step 5: Solve for x
   x = 70,440,707.85/12,978.17
6. Step 6: Final answer
   x = 5,427.63