Finding the Fourth Proportional to 22,928.78, 31,644.24 and 12,858.18

Step by Step Solution

1. Step 1: Write the proportion equation
   22,928.78 : 31,644.24 = 12,858.18 : x
2. Step 2: Convert to fraction form
   22,928.78/31,644.24 = 12,858.18/x
3. Step 3: Cross multiply
   22,928.78x = 31,644.24 × 12,858.18
4. Step 4: Simplify right side
   22,928.78x = 406,887,269.59
5. Step 5: Solve for x
   x = 406,887,269.59/22,928.78
6. Step 6: Final answer
   x = 17,745.70