Finding the Fourth Proportional to 21,967.34, 30,308.58 and 12,406.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,967.34 : 30,308.58 = 12,406.72 : x
2. Step 2: Convert to fraction form
   21,967.34/30,308.58 = 12,406.72/x
3. Step 3: Cross multiply
   21,967.34x = 30,308.58 × 12,406.72
4. Step 4: Simplify right side
   21,967.34x = 376,030,065.66
5. Step 5: Solve for x
   x = 376,030,065.66/21,967.34
6. Step 6: Final answer
   x = 17,117.69