Finding the Fourth Proportional to 21,955.50, 30,298.59 and 12,019.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,955.50 : 30,298.59 = 12,019.50 : x
2. Step 2: Convert to fraction form
   21,955.50/30,298.59 = 12,019.50/x
3. Step 3: Cross multiply
   21,955.50x = 30,298.59 × 12,019.50
4. Step 4: Simplify right side
   21,955.50x = 364,173,902.51
5. Step 5: Solve for x
   x = 364,173,902.51/21,955.50
6. Step 6: Final answer
   x = 16,586.91