Finding the Fourth Proportional to 12,019.68, 18,038.82 and 7,858.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,019.68 : 18,038.82 = 7,858.56 : x
2. Step 2: Convert to fraction form
   12,019.68/18,038.82 = 7,858.56/x
3. Step 3: Cross multiply
   12,019.68x = 18,038.82 × 7,858.56
4. Step 4: Simplify right side
   12,019.68x = 141,759,149.30
5. Step 5: Solve for x
   x = 141,759,149.30/12,019.68
6. Step 6: Final answer
   x = 11,793.92