Finding the Fourth Proportional to 12,019.93, 18,039.20 and 7,858.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,019.93 : 18,039.20 = 7,858.81 : x
2. Step 2: Convert to fraction form
   12,019.93/18,039.20 = 7,858.81/x
3. Step 3: Cross multiply
   12,019.93x = 18,039.20 × 7,858.81
4. Step 4: Simplify right side
   12,019.93x = 141,766,645.35
5. Step 5: Solve for x
   x = 141,766,645.35/12,019.93
6. Step 6: Final answer
   x = 11,794.30