Finding the Fourth Proportional to 105,561.50, 145,678.32 and 57,817.44

Step by Step Solution

1. Step 1: Write the proportion equation
   105,561.50 : 145,678.32 = 57,817.44 : x
2. Step 2: Convert to fraction form
   105,561.50/145,678.32 = 57,817.44/x
3. Step 3: Cross multiply
   105,561.50x = 145,678.32 × 57,817.44
4. Step 4: Simplify right side
   105,561.50x = 8,422,747,525.90
5. Step 5: Solve for x
   x = 8,422,747,525.90/105,561.50
6. Step 6: Final answer
   x = 79,789.96