Finding the Fourth Proportional to 76,578.71, 105,678.68 and 42,586.45

Step by Step Solution

1. Step 1: Write the proportion equation
   76,578.71 : 105,678.68 = 42,586.45 : x
2. Step 2: Convert to fraction form
   76,578.71/105,678.68 = 42,586.45/x
3. Step 3: Cross multiply
   76,578.71x = 105,678.68 × 42,586.45
4. Step 4: Simplify right side
   76,578.71x = 4,500,479,821.89
5. Step 5: Solve for x
   x = 4,500,479,821.89/76,578.71
6. Step 6: Final answer
   x = 58,769.33