Finding the Fourth Proportional to 76,399.57, 105,432.33 and 42,408.73

Step by Step Solution

1. Step 1: Write the proportion equation
   76,399.57 : 105,432.33 = 42,408.73 : x
2. Step 2: Convert to fraction form
   76,399.57/105,432.33 = 42,408.73/x
3. Step 3: Cross multiply
   76,399.57x = 105,432.33 × 42,408.73
4. Step 4: Simplify right side
   76,399.57x = 4,471,251,268.51
5. Step 5: Solve for x
   x = 4,471,251,268.51/76,399.57
6. Step 6: Final answer
   x = 58,524.56