Finding the Fourth Proportional to 105,111.72, 145,057.29 and 57,368.16

Step by Step Solution

1. Step 1: Write the proportion equation
   105,111.72 : 145,057.29 = 57,368.16 : x
2. Step 2: Convert to fraction form
   105,111.72/145,057.29 = 57,368.16/x
3. Step 3: Cross multiply
   105,111.72x = 145,057.29 × 57,368.16
4. Step 4: Simplify right side
   105,111.72x = 8,321,669,821.89
5. Step 5: Solve for x
   x = 8,321,669,821.89/105,111.72
6. Step 6: Final answer
   x = 79,169.76