Finding the Fourth Proportional to 99,728.85, 137,676.61 and 77,016.86

Step by Step Solution

1. Step 1: Write the proportion equation
   99,728.85 : 137,676.61 = 77,016.86 : x
2. Step 2: Convert to fraction form
   99,728.85/137,676.61 = 77,016.86/x
3. Step 3: Cross multiply
   99,728.85x = 137,676.61 × 77,016.86
4. Step 4: Simplify right side
   99,728.85x = 10,603,420,121.82
5. Step 5: Solve for x
   x = 10,603,420,121.82/99,728.85
6. Step 6: Final answer
   x = 106,322.49