Finding the Fourth Proportional to 80,991.81, 111,749.34 and 49,154.76

Step by Step Solution

1. Step 1: Write the proportion equation
   80,991.81 : 111,749.34 = 49,154.76 : x
2. Step 2: Convert to fraction form
   80,991.81/111,749.34 = 49,154.76/x
3. Step 3: Cross multiply
   80,991.81x = 111,749.34 × 49,154.76
4. Step 4: Simplify right side
   80,991.81x = 5,493,011,987.86
5. Step 5: Solve for x
   x = 5,493,011,987.86/80,991.81
6. Step 6: Final answer
   x = 67,821.82