Finding the Fourth Proportional to 21,962.42, 30,308.15 and 11,890.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,962.42 : 30,308.15 = 11,890.86 : x
2. Step 2: Convert to fraction form
   21,962.42/30,308.15 = 11,890.86/x
3. Step 3: Cross multiply
   21,962.42x = 30,308.15 × 11,890.86
4. Step 4: Simplify right side
   21,962.42x = 360,389,968.51
5. Step 5: Solve for x
   x = 360,389,968.51/21,962.42
6. Step 6: Final answer
   x = 16,409.39