Finding the Fourth Proportional to 10,902.46, 16,359.60 and 8,442.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,902.46 : 16,359.60 = 8,442.10 : x
2. Step 2: Convert to fraction form
   10,902.46/16,359.60 = 8,442.10/x
3. Step 3: Cross multiply
   10,902.46x = 16,359.60 × 8,442.10
4. Step 4: Simplify right side
   10,902.46x = 138,109,379.16
5. Step 5: Solve for x
   x = 138,109,379.16/10,902.46
6. Step 6: Final answer
   x = 12,667.73