Finding the Fourth Proportional to 76,399.29, 105,431.94 and 42,408.45

Step by Step Solution

1. Step 1: Write the proportion equation
   76,399.29 : 105,431.94 = 42,408.45 : x
2. Step 2: Convert to fraction form
   76,399.29/105,431.94 = 42,408.45/x
3. Step 3: Cross multiply
   76,399.29x = 105,431.94 × 42,408.45
4. Step 4: Simplify right side
   76,399.29x = 4,471,205,155.89
5. Step 5: Solve for x
   x = 4,471,205,155.89/76,399.29
6. Step 6: Final answer
   x = 58,524.17