Finding the Fourth Proportional to 78,040.58, 107,696.79 and 42,231.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,040.58 : 107,696.79 = 42,231.42 : x
2. Step 2: Convert to fraction form
   78,040.58/107,696.79 = 42,231.42/x
3. Step 3: Cross multiply
   78,040.58x = 107,696.79 × 42,231.42
4. Step 4: Simplify right side
   78,040.58x = 4,548,188,371.14
5. Step 5: Solve for x
   x = 4,548,188,371.14/78,040.58
6. Step 6: Final answer
   x = 58,279.79