Finding the Fourth Proportional to 76,389.93, 105,409.56 and 42,399.85

Step by Step Solution

1. Step 1: Write the proportion equation
   76,389.93 : 105,409.56 = 42,399.85 : x
2. Step 2: Convert to fraction form
   76,389.93/105,409.56 = 42,399.85/x
3. Step 3: Cross multiply
   76,389.93x = 105,409.56 × 42,399.85
4. Step 4: Simplify right side
   76,389.93x = 4,469,349,782.47
5. Step 5: Solve for x
   x = 4,469,349,782.47/76,389.93
6. Step 6: Final answer
   x = 58,507.05