Finding the Fourth Proportional to 28,356.78, 42,522.84 and 8,630.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,356.78 : 42,522.84 = 8,630.76 : x
2. Step 2: Convert to fraction form
   28,356.78/42,522.84 = 8,630.76/x
3. Step 3: Cross multiply
   28,356.78x = 42,522.84 × 8,630.76
4. Step 4: Simplify right side
   28,356.78x = 367,004,426.56
5. Step 5: Solve for x
   x = 367,004,426.56/28,356.78
6. Step 6: Final answer
   x = 12,942.39