Finding the Fourth Proportional to 105,490.82, 145,578.71 and 57,743.15

Step by Step Solution

1. Step 1: Write the proportion equation
   105,490.82 : 145,578.71 = 57,743.15 : x
2. Step 2: Convert to fraction form
   105,490.82/145,578.71 = 57,743.15/x
3. Step 3: Cross multiply
   105,490.82x = 145,578.71 × 57,743.15
4. Step 4: Simplify right side
   105,490.82x = 8,406,172,704.80
5. Step 5: Solve for x
   x = 8,406,172,704.80/105,490.82
6. Step 6: Final answer
   x = 79,686.29