Finding the Fourth Proportional to 12,483.60, 18,728.85 and 8,042.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,483.60 : 18,728.85 = 8,042.78 : x
2. Step 2: Convert to fraction form
   12,483.60/18,728.85 = 8,042.78/x
3. Step 3: Cross multiply
   12,483.60x = 18,728.85 × 8,042.78
4. Step 4: Simplify right side
   12,483.60x = 150,631,926.56
5. Step 5: Solve for x
   x = 150,631,926.56/12,483.60
6. Step 6: Final answer
   x = 12,066.39