Finding the Fourth Proportional to 28,456.56, 42,648.12 and 13,634.64

Step by Step Solution

1. Step 1: Write the proportion equation
   28,456.56 : 42,648.12 = 13,634.64 : x
2. Step 2: Convert to fraction form
   28,456.56/42,648.12 = 13,634.64/x
3. Step 3: Cross multiply
   28,456.56x = 42,648.12 × 13,634.64
4. Step 4: Simplify right side
   28,456.56x = 581,491,762.88
5. Step 5: Solve for x
   x = 581,491,762.88/28,456.56
6. Step 6: Final answer
   x = 20,434.37