Finding the Fourth Proportional to 12,745, 19,119.66 and 3,978.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,745 : 19,119.66 = 3,978.17 : x
2. Step 2: Convert to fraction form
   12,745/19,119.66 = 3,978.17/x
3. Step 3: Cross multiply
   12,745x = 19,119.66 × 3,978.17
4. Step 4: Simplify right side
   12,745x = 76,061,257.82
5. Step 5: Solve for x
   x = 76,061,257.82/12,745
6. Step 6: Final answer
   x = 5,967.93