Finding the Fourth Proportional to 21,835.27, 30,131.81 and 12,402.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,835.27 : 30,131.81 = 12,402.79 : x
2. Step 2: Convert to fraction form
   21,835.27/30,131.81 = 12,402.79/x
3. Step 3: Cross multiply
   21,835.27x = 30,131.81 × 12,402.79
4. Step 4: Simplify right side
   21,835.27x = 373,718,449.74
5. Step 5: Solve for x
   x = 373,718,449.74/21,835.27
6. Step 6: Final answer
   x = 17,115.36