Finding the Fourth Proportional to 12,694.06, 19,019.54 and 8,978.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,694.06 : 19,019.54 = 8,978.12 : x
2. Step 2: Convert to fraction form
   12,694.06/19,019.54 = 8,978.12/x
3. Step 3: Cross multiply
   12,694.06x = 19,019.54 × 8,978.12
4. Step 4: Simplify right side
   12,694.06x = 170,759,712.46
5. Step 5: Solve for x
   x = 170,759,712.46/12,694.06
6. Step 6: Final answer
   x = 13,451.94