Finding the Fourth Proportional to 76,578.96, 105,679.03 and 42,586.70

Step by Step Solution

1. Step 1: Write the proportion equation
   76,578.96 : 105,679.03 = 42,586.70 : x
2. Step 2: Convert to fraction form
   76,578.96/105,679.03 = 42,586.70/x
3. Step 3: Cross multiply
   76,578.96x = 105,679.03 × 42,586.70
4. Step 4: Simplify right side
   76,578.96x = 4,500,521,146.90
5. Step 5: Solve for x
   x = 4,500,521,146.90/76,578.96
6. Step 6: Final answer
   x = 58,769.68