Finding the Fourth Proportional to 22,715.78, 31,347.77 and 12,644.00

Step by Step Solution

1. Step 1: Write the proportion equation
   22,715.78 : 31,347.77 = 12,644.00 : x
2. Step 2: Convert to fraction form
   22,715.78/31,347.77 = 12,644.00/x
3. Step 3: Cross multiply
   22,715.78x = 31,347.77 × 12,644.00
4. Step 4: Simplify right side
   22,715.78x = 396,361,313.86
5. Step 5: Solve for x
   x = 396,361,313.86/22,715.78
6. Step 6: Final answer
   x = 17,448.72