Finding the Fourth Proportional to 78,450.67, 108,262.57 and 42,640.67

Step by Step Solution

1. Step 1: Write the proportion equation
   78,450.67 : 108,262.57 = 42,640.67 : x
2. Step 2: Convert to fraction form
   78,450.67/108,262.57 = 42,640.67/x
3. Step 3: Cross multiply
   78,450.67x = 108,262.57 × 42,640.67
4. Step 4: Simplify right side
   78,450.67x = 4,616,388,520.72
5. Step 5: Solve for x
   x = 4,616,388,520.72/78,450.67
6. Step 6: Final answer
   x = 58,844.48