Finding the Fourth Proportional to 105,558.09, 145,664.73 and 57,802.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,558.09 : 145,664.73 = 57,802.20 : x
2. Step 2: Convert to fraction form
   105,558.09/145,664.73 = 57,802.20/x
3. Step 3: Cross multiply
   105,558.09x = 145,664.73 × 57,802.20
4. Step 4: Simplify right side
   105,558.09x = 8,419,741,856.41
5. Step 5: Solve for x
   x = 8,419,741,856.41/105,558.09
6. Step 6: Final answer
   x = 79,764.06