Finding the Fourth Proportional to 105,144.39, 145,097.25 and 57,398.07

Step by Step Solution

1. Step 1: Write the proportion equation
   105,144.39 : 145,097.25 = 57,398.07 : x
2. Step 2: Convert to fraction form
   105,144.39/145,097.25 = 57,398.07/x
3. Step 3: Cross multiply
   105,144.39x = 145,097.25 × 57,398.07
4. Step 4: Simplify right side
   105,144.39x = 8,328,302,112.31
5. Step 5: Solve for x
   x = 8,328,302,112.31/105,144.39
6. Step 6: Final answer
   x = 79,208.24