Finding the Fourth Proportional to 28,217.79, 42,299.28 and 10,443.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,217.79 : 42,299.28 = 10,443.42 : x
2. Step 2: Convert to fraction form
   28,217.79/42,299.28 = 10,443.42/x
3. Step 3: Cross multiply
   28,217.79x = 42,299.28 × 10,443.42
4. Step 4: Simplify right side
   28,217.79x = 441,749,146.74
5. Step 5: Solve for x
   x = 441,749,146.74/28,217.79
6. Step 6: Final answer
   x = 15,654.99