Finding the Fourth Proportional to 76,439.56, 105,485.22 and 42,448.12

Step by Step Solution

1. Step 1: Write the proportion equation
   76,439.56 : 105,485.22 = 42,448.12 : x
2. Step 2: Convert to fraction form
   76,439.56/105,485.22 = 42,448.12/x
3. Step 3: Cross multiply
   76,439.56x = 105,485.22 × 42,448.12
4. Step 4: Simplify right side
   76,439.56x = 4,477,649,276.79
5. Step 5: Solve for x
   x = 4,477,649,276.79/76,439.56
6. Step 6: Final answer
   x = 58,577.64