Finding the Fourth Proportional to 80,582.13, 120,928.72 and 27,991.61

Step by Step Solution

1. Step 1: Write the proportion equation
   80,582.13 : 120,928.72 = 27,991.61 : x
2. Step 2: Convert to fraction form
   80,582.13/120,928.72 = 27,991.61/x
3. Step 3: Cross multiply
   80,582.13x = 120,928.72 × 27,991.61
4. Step 4: Simplify right side
   80,582.13x = 3,384,989,568.04
5. Step 5: Solve for x
   x = 3,384,989,568.04/80,582.13
6. Step 6: Final answer
   x = 42,006.70