Finding the Fourth Proportional to 76,372.81, 105,391.69 and 42,382.78

Step by Step Solution

1. Step 1: Write the proportion equation
   76,372.81 : 105,391.69 = 42,382.78 : x
2. Step 2: Convert to fraction form
   76,372.81/105,391.69 = 42,382.78/x
3. Step 3: Cross multiply
   76,372.81x = 105,391.69 × 42,382.78
4. Step 4: Simplify right side
   76,372.81x = 4,466,792,441.66
5. Step 5: Solve for x
   x = 4,466,792,441.66/76,372.81
6. Step 6: Final answer
   x = 58,486.69