Finding the Fourth Proportional to 21,515.52, 32,281.56 and 10,421.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,515.52 : 32,281.56 = 10,421.34 : x
2. Step 2: Convert to fraction form
   21,515.52/32,281.56 = 10,421.34/x
3. Step 3: Cross multiply
   21,515.52x = 32,281.56 × 10,421.34
4. Step 4: Simplify right side
   21,515.52x = 336,417,112.49
5. Step 5: Solve for x
   x = 336,417,112.49/21,515.52
6. Step 6: Final answer
   x = 15,636.02