Finding the Fourth Proportional to 78,728.14, 108,644.25 and 42,918.04

Step by Step Solution

1. Step 1: Write the proportion equation
   78,728.14 : 108,644.25 = 42,918.04 : x
2. Step 2: Convert to fraction form
   78,728.14/108,644.25 = 42,918.04/x
3. Step 3: Cross multiply
   78,728.14x = 108,644.25 × 42,918.04
4. Step 4: Simplify right side
   78,728.14x = 4,662,798,267.27
5. Step 5: Solve for x
   x = 4,662,798,267.27/78,728.14
6. Step 6: Final answer
   x = 59,226.58