Finding the Fourth Proportional to 22,918.50, 31,620.42 and 12,845.54

Step by Step Solution

1. Step 1: Write the proportion equation
   22,918.50 : 31,620.42 = 12,845.54 : x
2. Step 2: Convert to fraction form
   22,918.50/31,620.42 = 12,845.54/x
3. Step 3: Cross multiply
   22,918.50x = 31,620.42 × 12,845.54
4. Step 4: Simplify right side
   22,918.50x = 406,181,211.82
5. Step 5: Solve for x
   x = 406,181,211.82/22,918.50
6. Step 6: Final answer
   x = 17,722.85