Finding the Fourth Proportional to 105,429.68, 145,496.42 and 57,681.94

Step by Step Solution

1. Step 1: Write the proportion equation
   105,429.68 : 145,496.42 = 57,681.94 : x
2. Step 2: Convert to fraction form
   105,429.68/145,496.42 = 57,681.94/x
3. Step 3: Cross multiply
   105,429.68x = 145,496.42 × 57,681.94
4. Step 4: Simplify right side
   105,429.68x = 8,392,515,768.65
5. Step 5: Solve for x
   x = 8,392,515,768.65/105,429.68
6. Step 6: Final answer
   x = 79,602.97