Finding the Fourth Proportional to 22,791.30, 31,451.91 and 12,719.64

Step by Step Solution

1. Step 1: Write the proportion equation
   22,791.30 : 31,451.91 = 12,719.64 : x
2. Step 2: Convert to fraction form
   22,791.30/31,451.91 = 12,719.64/x
3. Step 3: Cross multiply
   22,791.30x = 31,451.91 × 12,719.64
4. Step 4: Simplify right side
   22,791.30x = 400,056,972.51
5. Step 5: Solve for x
   x = 400,056,972.51/22,791.30
6. Step 6: Final answer
   x = 17,553.06