Finding the Fourth Proportional to 12,986.78, 19,484.69 and 4,103.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.78 : 19,484.69 = 4,103.46 : x
2. Step 2: Convert to fraction form
   12,986.78/19,484.69 = 4,103.46/x
3. Step 3: Cross multiply
   12,986.78x = 19,484.69 × 4,103.46
4. Step 4: Simplify right side
   12,986.78x = 79,954,625.51
5. Step 5: Solve for x
   x = 79,954,625.51/12,986.78
6. Step 6: Final answer
   x = 6,156.62