Finding the Fourth Proportional to 76,392.71, 105,420.35 and 42,399.20

Step by Step Solution

1. Step 1: Write the proportion equation
   76,392.71 : 105,420.35 = 42,399.20 : x
2. Step 2: Convert to fraction form
   76,392.71/105,420.35 = 42,399.20/x
3. Step 3: Cross multiply
   76,392.71x = 105,420.35 × 42,399.20
4. Step 4: Simplify right side
   76,392.71x = 4,469,738,820.27
5. Step 5: Solve for x
   x = 4,469,738,820.27/76,392.71
6. Step 6: Final answer
   x = 58,510.02