Finding the Fourth Proportional to 80,816, 111,636.16 and 76,878.72

Step by Step Solution

1. Step 1: Write the proportion equation
   80,816 : 111,636.16 = 76,878.72 : x
2. Step 2: Convert to fraction form
   80,816/111,636.16 = 76,878.72/x
3. Step 3: Cross multiply
   80,816x = 111,636.16 × 76,878.72
4. Step 4: Simplify right side
   80,816x = 8,582,445,086.52
5. Step 5: Solve for x
   x = 8,582,445,086.52/80,816
6. Step 6: Final answer
   x = 106,197.35