Finding the Fourth Proportional to 39,918.62, 55,086.72 and 22,013.30

Step by Step Solution

1. Step 1: Write the proportion equation
   39,918.62 : 55,086.72 = 22,013.30 : x
2. Step 2: Convert to fraction form
   39,918.62/55,086.72 = 22,013.30/x
3. Step 3: Cross multiply
   39,918.62x = 55,086.72 × 22,013.30
4. Step 4: Simplify right side
   39,918.62x = 1,212,640,493.38
5. Step 5: Solve for x
   x = 1,212,640,493.38/39,918.62
6. Step 6: Final answer
   x = 30,377.82