Finding the Fourth Proportional to 78,448.05, 108,259.41 and 42,638.05

Step by Step Solution

1. Step 1: Write the proportion equation
   78,448.05 : 108,259.41 = 42,638.05 : x
2. Step 2: Convert to fraction form
   78,448.05/108,259.41 = 42,638.05/x
3. Step 3: Cross multiply
   78,448.05x = 108,259.41 × 42,638.05
4. Step 4: Simplify right side
   78,448.05x = 4,615,970,136.55
5. Step 5: Solve for x
   x = 4,615,970,136.55/78,448.05
6. Step 6: Final answer
   x = 58,841.11