Finding the Fourth Proportional to 12,015.23, 17,991.30 and 8,486.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,015.23 : 17,991.30 = 8,486.15 : x
2. Step 2: Convert to fraction form
   12,015.23/17,991.30 = 8,486.15/x
3. Step 3: Cross multiply
   12,015.23x = 17,991.30 × 8,486.15
4. Step 4: Simplify right side
   12,015.23x = 152,676,870.50
5. Step 5: Solve for x
   x = 152,676,870.50/12,015.23
6. Step 6: Final answer
   x = 12,706.95