Finding the Fourth Proportional to 78,179.20, 107,886.72 and 42,369.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,179.20 : 107,886.72 = 42,369.28 : x
2. Step 2: Convert to fraction form
   78,179.20/107,886.72 = 42,369.28/x
3. Step 3: Cross multiply
   78,179.20x = 107,886.72 × 42,369.28
4. Step 4: Simplify right side
   78,179.20x = 4,571,082,647.96
5. Step 5: Solve for x
   x = 4,571,082,647.96/78,179.20
6. Step 6: Final answer
   x = 58,469.29