Finding the Fourth Proportional to 39,986.78, 55,181.50 and 22,081.62

Step by Step Solution

1. Step 1: Write the proportion equation
   39,986.78 : 55,181.50 = 22,081.62 : x
2. Step 2: Convert to fraction form
   39,986.78/55,181.50 = 22,081.62/x
3. Step 3: Cross multiply
   39,986.78x = 55,181.50 × 22,081.62
4. Step 4: Simplify right side
   39,986.78x = 1,218,496,914.03
5. Step 5: Solve for x
   x = 1,218,496,914.03/39,986.78
6. Step 6: Final answer
   x = 30,472.49