Finding the Fourth Proportional to 78,448.53, 108,259.64 and 42,638.54

Step by Step Solution

1. Step 1: Write the proportion equation
   78,448.53 : 108,259.64 = 42,638.54 : x
2. Step 2: Convert to fraction form
   78,448.53/108,259.64 = 42,638.54/x
3. Step 3: Cross multiply
   78,448.53x = 108,259.64 × 42,638.54
4. Step 4: Simplify right side
   78,448.53x = 4,616,032,990.53
5. Step 5: Solve for x
   x = 4,616,032,990.53/78,448.53
6. Step 6: Final answer
   x = 58,841.55