Finding the Fourth Proportional to 8,457.18, 12,689.01 and 3,191.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,457.18 : 12,689.01 = 3,191.82 : x
2. Step 2: Convert to fraction form
   8,457.18/12,689.01 = 3,191.82/x
3. Step 3: Cross multiply
   8,457.18x = 12,689.01 × 3,191.82
4. Step 4: Simplify right side
   8,457.18x = 40,501,035.90
5. Step 5: Solve for x
   x = 40,501,035.90/8,457.18
6. Step 6: Final answer
   x = 4,788.95