Finding the Fourth Proportional to 12,015.78, 17,986.71 and 7,846.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,015.78 : 17,986.71 = 7,846.80 : x
2. Step 2: Convert to fraction form
   12,015.78/17,986.71 = 7,846.80/x
3. Step 3: Cross multiply
   12,015.78x = 17,986.71 × 7,846.80
4. Step 4: Simplify right side
   12,015.78x = 141,138,116.03
5. Step 5: Solve for x
   x = 141,138,116.03/12,015.78
6. Step 6: Final answer
   x = 11,746.06