Finding the Fourth Proportional to 76,399.48, 105,426 and 42,406.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,399.48 : 105,426 = 42,406.72 : x
2. Step 2: Convert to fraction form
   76,399.48/105,426 = 42,406.72/x
3. Step 3: Cross multiply
   76,399.48x = 105,426 × 42,406.72
4. Step 4: Simplify right side
   76,399.48x = 4,470,770,862.72
5. Step 5: Solve for x
   x = 4,470,770,862.72/76,399.48
6. Step 6: Final answer
   x = 58,518.34