Finding the Fourth Proportional to 105,487.81, 145,573.34 and 57,744.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,487.81 : 145,573.34 = 57,744.18 : x
2. Step 2: Convert to fraction form
   105,487.81/145,573.34 = 57,744.18/x
3. Step 3: Cross multiply
   105,487.81x = 145,573.34 × 57,744.18
4. Step 4: Simplify right side
   105,487.81x = 8,406,013,148.16
5. Step 5: Solve for x
   x = 8,406,013,148.16/105,487.81
6. Step 6: Final answer
   x = 79,687.06