Finding the Fourth Proportional to 78,243.67, 117,336.03 and 28,311.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,243.67 : 117,336.03 = 28,311.42 : x
2. Step 2: Convert to fraction form
   78,243.67/117,336.03 = 28,311.42/x
3. Step 3: Cross multiply
   78,243.67x = 117,336.03 × 28,311.42
4. Step 4: Simplify right side
   78,243.67x = 3,321,949,626.46
5. Step 5: Solve for x
   x = 3,321,949,626.46/78,243.67
6. Step 6: Final answer
   x = 42,456.46