Finding the Fourth Proportional to 21,405.52, 32,109.72 and 8,258

Step by Step Solution

1. Step 1: Write the proportion equation
   21,405.52 : 32,109.72 = 8,258 : x
2. Step 2: Convert to fraction form
   21,405.52/32,109.72 = 8,258/x
3. Step 3: Cross multiply
   21,405.52x = 32,109.72 × 8,258
4. Step 4: Simplify right side
   21,405.52x = 265,162,067.76
5. Step 5: Solve for x
   x = 265,162,067.76/21,405.52
6. Step 6: Final answer
   x = 12,387.56