Finding the Fourth Proportional to 21,835.94, 30,132.68 and 12,405.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,835.94 : 30,132.68 = 12,405.38 : x
2. Step 2: Convert to fraction form
   21,835.94/30,132.68 = 12,405.38/x
3. Step 3: Cross multiply
   21,835.94x = 30,132.68 × 12,405.38
4. Step 4: Simplify right side
   21,835.94x = 373,807,345.82
5. Step 5: Solve for x
   x = 373,807,345.82/21,835.94
6. Step 6: Final answer
   x = 17,118.90