Finding the Fourth Proportional to 12,870.23, 19,268.94 and 8,178.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.23 : 19,268.94 = 8,178.61 : x
2. Step 2: Convert to fraction form
   12,870.23/19,268.94 = 8,178.61/x
3. Step 3: Cross multiply
   12,870.23x = 19,268.94 × 8,178.61
4. Step 4: Simplify right side
   12,870.23x = 157,593,145.37
5. Step 5: Solve for x
   x = 157,593,145.37/12,870.23
6. Step 6: Final answer
   x = 12,244.78