Finding the Fourth Proportional to 105,488.91, 145,574.88 and 57,745.29

Step by Step Solution

1. Step 1: Write the proportion equation
   105,488.91 : 145,574.88 = 57,745.29 : x
2. Step 2: Convert to fraction form
   105,488.91/145,574.88 = 57,745.29/x
3. Step 3: Cross multiply
   105,488.91x = 145,574.88 × 57,745.29
4. Step 4: Simplify right side
   105,488.91x = 8,406,263,662.32
5. Step 5: Solve for x
   x = 8,406,263,662.32/105,488.91
6. Step 6: Final answer
   x = 79,688.60