Finding the Fourth Proportional to 80,978.60, 111,731.46 and 49,146.76

Step by Step Solution

1. Step 1: Write the proportion equation
   80,978.60 : 111,731.46 = 49,146.76 : x
2. Step 2: Convert to fraction form
   80,978.60/111,731.46 = 49,146.76/x
3. Step 3: Cross multiply
   80,978.60x = 111,731.46 × 49,146.76
4. Step 4: Simplify right side
   80,978.60x = 5,491,239,249.07
5. Step 5: Solve for x
   x = 5,491,239,249.07/80,978.60
6. Step 6: Final answer
   x = 67,810.99