Finding the Fourth Proportional to 12,020.18, 18,039.57 and 7,859.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,020.18 : 18,039.57 = 7,859.06 : x
2. Step 2: Convert to fraction form
   12,020.18/18,039.57 = 7,859.06/x
3. Step 3: Cross multiply
   12,020.18x = 18,039.57 × 7,859.06
4. Step 4: Simplify right side
   12,020.18x = 141,774,063.00
5. Step 5: Solve for x
   x = 141,774,063.00/12,020.18
6. Step 6: Final answer
   x = 11,794.67