Finding the Fourth Proportional to 8,572.72, 12,861.87 and 3,892.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,572.72 : 12,861.87 = 3,892.18 : x
2. Step 2: Convert to fraction form
   8,572.72/12,861.87 = 3,892.18/x
3. Step 3: Cross multiply
   8,572.72x = 12,861.87 × 3,892.18
4. Step 4: Simplify right side
   8,572.72x = 50,060,713.18
5. Step 5: Solve for x
   x = 50,060,713.18/8,572.72
6. Step 6: Final answer
   x = 5,839.54