Finding the Fourth Proportional to 105,020.16, 144,931.34 and 57,276.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,020.16 : 144,931.34 = 57,276.12 : x
2. Step 2: Convert to fraction form
   105,020.16/144,931.34 = 57,276.12/x
3. Step 3: Cross multiply
   105,020.16x = 144,931.34 × 57,276.12
4. Step 4: Simplify right side
   105,020.16x = 8,301,104,821.60
5. Step 5: Solve for x
   x = 8,301,104,821.60/105,020.16
6. Step 6: Final answer
   x = 79,042.96