Finding the Fourth Proportional to 105,196.33, 145,171.47 and 57,449.68

Step by Step Solution

1. Step 1: Write the proportion equation
   105,196.33 : 145,171.47 = 57,449.68 : x
2. Step 2: Convert to fraction form
   105,196.33/145,171.47 = 57,449.68/x
3. Step 3: Cross multiply
   105,196.33x = 145,171.47 × 57,449.68
4. Step 4: Simplify right side
   105,196.33x = 8,340,054,496.63
5. Step 5: Solve for x
   x = 8,340,054,496.63/105,196.33
6. Step 6: Final answer
   x = 79,280.85