Finding the Fourth Proportional to 105,111.10, 145,053.72 and 57,365.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,111.10 : 145,053.72 = 57,365.50 : x
2. Step 2: Convert to fraction form
   105,111.10/145,053.72 = 57,365.50/x
3. Step 3: Cross multiply
   105,111.10x = 145,053.72 × 57,365.50
4. Step 4: Simplify right side
   105,111.10x = 8,321,079,174.66
5. Step 5: Solve for x
   x = 8,321,079,174.66/105,111.10
6. Step 6: Final answer
   x = 79,164.61