Finding the Fourth Proportional to 28,298.79, 42,445.73 and 9,578.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,298.79 : 42,445.73 = 9,578.42 : x
2. Step 2: Convert to fraction form
   28,298.79/42,445.73 = 9,578.42/x
3. Step 3: Cross multiply
   28,298.79x = 42,445.73 × 9,578.42
4. Step 4: Simplify right side
   28,298.79x = 406,562,769.03
5. Step 5: Solve for x
   x = 406,562,769.03/28,298.79
6. Step 6: Final answer
   x = 14,366.79