Finding the Fourth Proportional to 102,171.72, 140,995.62 and 57,459.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,171.72 : 140,995.62 = 57,459.72 : x
2. Step 2: Convert to fraction form
   102,171.72/140,995.62 = 57,459.72/x
3. Step 3: Cross multiply
   102,171.72x = 140,995.62 × 57,459.72
4. Step 4: Simplify right side
   102,171.72x = 8,101,568,846.43
5. Step 5: Solve for x
   x = 8,101,568,846.43/102,171.72
6. Step 6: Final answer
   x = 79,293.65