Finding the Fourth Proportional to 39,986.72, 55,182.12 and 22,081.70

Step by Step Solution

1. Step 1: Write the proportion equation
   39,986.72 : 55,182.12 = 22,081.70 : x
2. Step 2: Convert to fraction form
   39,986.72/55,182.12 = 22,081.70/x
3. Step 3: Cross multiply
   39,986.72x = 55,182.12 × 22,081.70
4. Step 4: Simplify right side
   39,986.72x = 1,218,515,019.20
5. Step 5: Solve for x
   x = 1,218,515,019.20/39,986.72
6. Step 6: Final answer
   x = 30,472.99