Finding the Fourth Proportional to 105,085.44, 145,017.86 and 57,338.96

Step by Step Solution

1. Step 1: Write the proportion equation
   105,085.44 : 145,017.86 = 57,338.96 : x
2. Step 2: Convert to fraction form
   105,085.44/145,017.86 = 57,338.96/x
3. Step 3: Cross multiply
   105,085.44x = 145,017.86 × 57,338.96
4. Step 4: Simplify right side
   105,085.44x = 8,315,173,273.83
5. Step 5: Solve for x
   x = 8,315,173,273.83/105,085.44
6. Step 6: Final answer
   x = 79,127.74