Finding the Fourth Proportional to 105,019.16, 144,929.96 and 57,275.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,019.16 : 144,929.96 = 57,275.12 : x
2. Step 2: Convert to fraction form
   105,019.16/144,929.96 = 57,275.12/x
3. Step 3: Cross multiply
   105,019.16x = 144,929.96 × 57,275.12
4. Step 4: Simplify right side
   105,019.16x = 8,300,880,850.60
5. Step 5: Solve for x
   x = 8,300,880,850.60/105,019.16
6. Step 6: Final answer
   x = 79,041.58