Finding the Fourth Proportional to 22,811.77, 31,480.91 and 12,740.05

Step by Step Solution

1. Step 1: Write the proportion equation
   22,811.77 : 31,480.91 = 12,740.05 : x
2. Step 2: Convert to fraction form
   22,811.77/31,480.91 = 12,740.05/x
3. Step 3: Cross multiply
   22,811.77x = 31,480.91 × 12,740.05
4. Step 4: Simplify right side
   22,811.77x = 401,068,367.45
5. Step 5: Solve for x
   x = 401,068,367.45/22,811.77
6. Step 6: Final answer
   x = 17,581.64