Finding the Fourth Proportional to 76,391.05, 105,418.07 and 42,397.56

Step by Step Solution

1. Step 1: Write the proportion equation
   76,391.05 : 105,418.07 = 42,397.56 : x
2. Step 2: Convert to fraction form
   76,391.05/105,418.07 = 42,397.56/x
3. Step 3: Cross multiply
   76,391.05x = 105,418.07 × 42,397.56
4. Step 4: Simplify right side
   76,391.05x = 4,469,468,947.91
5. Step 5: Solve for x
   x = 4,469,468,947.91/76,391.05
6. Step 6: Final answer
   x = 58,507.76