Finding the Fourth Proportional to 39,986.78, 55,179.42 and 22,081.34

Step by Step Solution

1. Step 1: Write the proportion equation
   39,986.78 : 55,179.42 = 22,081.34 : x
2. Step 2: Convert to fraction form
   39,986.78/55,179.42 = 22,081.34/x
3. Step 3: Cross multiply
   39,986.78x = 55,179.42 × 22,081.34
4. Step 4: Simplify right side
   39,986.78x = 1,218,435,534.02
5. Step 5: Solve for x
   x = 1,218,435,534.02/39,986.78
6. Step 6: Final answer
   x = 30,470.96