Finding the Fourth Proportional to 105,401.48, 145,450.94 and 57,653.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,401.48 : 145,450.94 = 57,653.80 : x
2. Step 2: Convert to fraction form
   105,401.48/145,450.94 = 57,653.80/x
3. Step 3: Cross multiply
   105,401.48x = 145,450.94 × 57,653.80
4. Step 4: Simplify right side
   105,401.48x = 8,385,799,404.57
5. Step 5: Solve for x
   x = 8,385,799,404.57/105,401.48
6. Step 6: Final answer
   x = 79,560.55