Finding the Fourth Proportional to 78,448.36, 108,259.38 and 42,638.38

Step by Step Solution

1. Step 1: Write the proportion equation
   78,448.36 : 108,259.38 = 42,638.38 : x
2. Step 2: Convert to fraction form
   78,448.36/108,259.38 = 42,638.38/x
3. Step 3: Cross multiply
   78,448.36x = 108,259.38 × 42,638.38
4. Step 4: Simplify right side
   78,448.36x = 4,616,004,583.00
5. Step 5: Solve for x
   x = 4,616,004,583.00/78,448.36
6. Step 6: Final answer
   x = 58,841.31