Finding the Fourth Proportional to 76,389.05, 105,415.31 and 42,395.56

Step by Step Solution

1. Step 1: Write the proportion equation
   76,389.05 : 105,415.31 = 42,395.56 : x
2. Step 2: Convert to fraction form
   76,389.05/105,415.31 = 42,395.56/x
3. Step 3: Cross multiply
   76,389.05x = 105,415.31 × 42,395.56
4. Step 4: Simplify right side
   76,389.05x = 4,469,140,942.47
5. Step 5: Solve for x
   x = 4,469,140,942.47/76,389.05
6. Step 6: Final answer
   x = 58,504.99