Finding the Fourth Proportional to 102,145.50, 140,960.79 and 57,433.50

Step by Step Solution

1. Step 1: Write the proportion equation
   102,145.50 : 140,960.79 = 57,433.50 : x
2. Step 2: Convert to fraction form
   102,145.50/140,960.79 = 57,433.50/x
3. Step 3: Cross multiply
   102,145.50x = 140,960.79 × 57,433.50
4. Step 4: Simplify right side
   102,145.50x = 8,095,871,532.47
5. Step 5: Solve for x
   x = 8,095,871,532.47/102,145.50
6. Step 6: Final answer
   x = 79,258.23