Finding the Fourth Proportional to 8,457.48, 12,685.41 and 3,777.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,457.48 : 12,685.41 = 3,777.57 : x
2. Step 2: Convert to fraction form
   8,457.48/12,685.41 = 3,777.57/x
3. Step 3: Cross multiply
   8,457.48x = 12,685.41 × 3,777.57
4. Step 4: Simplify right side
   8,457.48x = 47,920,024.25
5. Step 5: Solve for x
   x = 47,920,024.25/8,457.48
6. Step 6: Final answer
   x = 5,665.99