Finding the Fourth Proportional to 78,448.16, 108,259.12 and 42,638.16

Step by Step Solution

1. Step 1: Write the proportion equation
   78,448.16 : 108,259.12 = 42,638.16 : x
2. Step 2: Convert to fraction form
   78,448.16/108,259.12 = 42,638.16/x
3. Step 3: Cross multiply
   78,448.16x = 108,259.12 × 42,638.16
4. Step 4: Simplify right side
   78,448.16x = 4,615,970,139.29
5. Step 5: Solve for x
   x = 4,615,970,139.29/78,448.16
6. Step 6: Final answer
   x = 58,841.02