Finding the Fourth Proportional to 21,063.92, 31,584.12 and 13,256

Step by Step Solution

1. Step 1: Write the proportion equation
   21,063.92 : 31,584.12 = 13,256 : x
2. Step 2: Convert to fraction form
   21,063.92/31,584.12 = 13,256/x
3. Step 3: Cross multiply
   21,063.92x = 31,584.12 × 13,256
4. Step 4: Simplify right side
   21,063.92x = 418,679,094.72
5. Step 5: Solve for x
   x = 418,679,094.72/21,063.92
6. Step 6: Final answer
   x = 19,876.60