Finding the Fourth Proportional to 99,765.72, 137,676.78 and 55,053.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,765.72 : 137,676.78 = 55,053.72 : x
2. Step 2: Convert to fraction form
   99,765.72/137,676.78 = 55,053.72/x
3. Step 3: Cross multiply
   99,765.72x = 137,676.78 × 55,053.72
4. Step 4: Simplify right side
   99,765.72x = 7,579,618,896.62
5. Step 5: Solve for x
   x = 7,579,618,896.62/99,765.72
6. Step 6: Final answer
   x = 75,974.18