Finding the Fourth Proportional to 78,469.18, 108,289.59 and 42,661.65

Step by Step Solution

1. Step 1: Write the proportion equation
   78,469.18 : 108,289.59 = 42,661.65 : x
2. Step 2: Convert to fraction form
   78,469.18/108,289.59 = 42,661.65/x
3. Step 3: Cross multiply
   78,469.18x = 108,289.59 × 42,661.65
4. Step 4: Simplify right side
   78,469.18x = 4,619,812,587.22
5. Step 5: Solve for x
   x = 4,619,812,587.22/78,469.18
6. Step 6: Final answer
   x = 58,874.23