Finding the Fourth Proportional to 21,836.46, 30,134.16 and 12,405.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,836.46 : 30,134.16 = 12,405.02 : x
2. Step 2: Convert to fraction form
   21,836.46/30,134.16 = 12,405.02/x
3. Step 3: Cross multiply
   21,836.46x = 30,134.16 × 12,405.02
4. Step 4: Simplify right side
   21,836.46x = 373,814,979.34
5. Step 5: Solve for x
   x = 373,814,979.34/21,836.46
6. Step 6: Final answer
   x = 17,118.85