Finding the Fourth Proportional to 78,448.29, 108,259.37 and 42,638.39

Step by Step Solution

1. Step 1: Write the proportion equation
   78,448.29 : 108,259.37 = 42,638.39 : x
2. Step 2: Convert to fraction form
   78,448.29/108,259.37 = 42,638.39/x
3. Step 3: Cross multiply
   78,448.29x = 108,259.37 × 42,638.39
4. Step 4: Simplify right side
   78,448.29x = 4,616,004,484.73
5. Step 5: Solve for x
   x = 4,616,004,484.73/78,448.29
6. Step 6: Final answer
   x = 58,841.37