Finding the Fourth Proportional to 99,765.98, 137,665.74 and 57,338.18

Step by Step Solution

1. Step 1: Write the proportion equation
   99,765.98 : 137,665.74 = 57,338.18 : x
2. Step 2: Convert to fraction form
   99,765.98/137,665.74 = 57,338.18/x
3. Step 3: Cross multiply
   99,765.98x = 137,665.74 × 57,338.18
4. Step 4: Simplify right side
   99,765.98x = 7,893,503,022.89
5. Step 5: Solve for x
   x = 7,893,503,022.89/99,765.98
6. Step 6: Final answer
   x = 79,120.19