Finding the Fourth Proportional to 76,144.20, 105,077.36 and 42,150.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,144.20 : 105,077.36 = 42,150.72 : x
2. Step 2: Convert to fraction form
   76,144.20/105,077.36 = 42,150.72/x
3. Step 3: Cross multiply
   76,144.20x = 105,077.36 × 42,150.72
4. Step 4: Simplify right side
   76,144.20x = 4,429,086,379.70
5. Step 5: Solve for x
   x = 4,429,086,379.70/76,144.20
6. Step 6: Final answer
   x = 58,167.09