Finding the Fourth Proportional to 21,339.58, 31,987.50 and 8,188.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,339.58 : 31,987.50 = 8,188.42 : x
2. Step 2: Convert to fraction form
   21,339.58/31,987.50 = 8,188.42/x
3. Step 3: Cross multiply
   21,339.58x = 31,987.50 × 8,188.42
4. Step 4: Simplify right side
   21,339.58x = 261,927,084.75
5. Step 5: Solve for x
   x = 261,927,084.75/21,339.58
6. Step 6: Final answer
   x = 12,274.24