Finding the Fourth Proportional to 28,404.40, 42,605.12 and 10,872.88

Step by Step Solution

1. Step 1: Write the proportion equation
   28,404.40 : 42,605.12 = 10,872.88 : x
2. Step 2: Convert to fraction form
   28,404.40/42,605.12 = 10,872.88/x
3. Step 3: Cross multiply
   28,404.40x = 42,605.12 × 10,872.88
4. Step 4: Simplify right side
   28,404.40x = 463,240,357.15
5. Step 5: Solve for x
   x = 463,240,357.15/28,404.40
6. Step 6: Final answer
   x = 16,308.75