Finding the Fourth Proportional to 105,696.38, 145,870.17 and 57,959.03

Step by Step Solution

1. Step 1: Write the proportion equation
   105,696.38 : 145,870.17 = 57,959.03 : x
2. Step 2: Convert to fraction form
   105,696.38/145,870.17 = 57,959.03/x
3. Step 3: Cross multiply
   105,696.38x = 145,870.17 × 57,959.03
4. Step 4: Simplify right side
   105,696.38x = 8,454,493,559.14
5. Step 5: Solve for x
   x = 8,454,493,559.14/105,696.38
6. Step 6: Final answer
   x = 79,988.49