Finding the Fourth Proportional to 105,018.16, 144,928.58 and 57,274.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,018.16 : 144,928.58 = 57,274.12 : x
2. Step 2: Convert to fraction form
   105,018.16/144,928.58 = 57,274.12/x
3. Step 3: Cross multiply
   105,018.16x = 144,928.58 × 57,274.12
4. Step 4: Simplify right side
   105,018.16x = 8,300,656,882.35
5. Step 5: Solve for x
   x = 8,300,656,882.35/105,018.16
6. Step 6: Final answer
   x = 79,040.20