Finding the Fourth Proportional to 78,028.45, 107,679.27 and 42,218.35

Step by Step Solution

1. Step 1: Write the proportion equation
   78,028.45 : 107,679.27 = 42,218.35 : x
2. Step 2: Convert to fraction form
   78,028.45/107,679.27 = 42,218.35/x
3. Step 3: Cross multiply
   78,028.45x = 107,679.27 × 42,218.35
4. Step 4: Simplify right side
   78,028.45x = 4,546,040,997.73
5. Step 5: Solve for x
   x = 4,546,040,997.73/78,028.45
6. Step 6: Final answer
   x = 58,261.33