Finding the Fourth Proportional to 76,395.12, 105,426.38 and 42,405.78

Step by Step Solution

1. Step 1: Write the proportion equation
   76,395.12 : 105,426.38 = 42,405.78 : x
2. Step 2: Convert to fraction form
   76,395.12/105,426.38 = 42,405.78/x
3. Step 3: Cross multiply
   76,395.12x = 105,426.38 × 42,405.78
4. Step 4: Simplify right side
   76,395.12x = 4,470,687,876.48
5. Step 5: Solve for x
   x = 4,470,687,876.48/76,395.12
6. Step 6: Final answer
   x = 58,520.59