Finding the Fourth Proportional to 22,631.39, 31,209.62 and 13,555.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,631.39 : 31,209.62 = 13,555.31 : x
2. Step 2: Convert to fraction form
   22,631.39/31,209.62 = 13,555.31/x
3. Step 3: Cross multiply
   22,631.39x = 31,209.62 × 13,555.31
4. Step 4: Simplify right side
   22,631.39x = 423,055,918.03
5. Step 5: Solve for x
   x = 423,055,918.03/22,631.39
6. Step 6: Final answer
   x = 18,693.32