Finding the Fourth Proportional to 105,429.80, 145,493.48 and 57,683

Step by Step Solution

1. Step 1: Write the proportion equation
   105,429.80 : 145,493.48 = 57,683 : x
2. Step 2: Convert to fraction form
   105,429.80/145,493.48 = 57,683/x
3. Step 3: Cross multiply
   105,429.80x = 145,493.48 × 57,683
4. Step 4: Simplify right side
   105,429.80x = 8,392,500,406.84
5. Step 5: Solve for x
   x = 8,392,500,406.84/105,429.80
6. Step 6: Final answer
   x = 79,602.73