Finding the Fourth Proportional to 78,448.67, 108,259.81 and 42,638.67

Step by Step Solution

1. Step 1: Write the proportion equation
   78,448.67 : 108,259.81 = 42,638.67 : x
2. Step 2: Convert to fraction form
   78,448.67/108,259.81 = 42,638.67/x
3. Step 3: Cross multiply
   78,448.67x = 108,259.81 × 42,638.67
4. Step 4: Simplify right side
   78,448.67x = 4,616,053,771.55
5. Step 5: Solve for x
   x = 4,616,053,771.55/78,448.67
6. Step 6: Final answer
   x = 58,841.71