Finding the Fourth Proportional to 12,142.59, 18,216.63 and 3,709.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,142.59 : 18,216.63 = 3,709.86 : x
2. Step 2: Convert to fraction form
   12,142.59/18,216.63 = 3,709.86/x
3. Step 3: Cross multiply
   12,142.59x = 18,216.63 × 3,709.86
4. Step 4: Simplify right side
   12,142.59x = 67,581,146.97
5. Step 5: Solve for x
   x = 67,581,146.97/12,142.59
6. Step 6: Final answer
   x = 5,565.63