Finding the Fourth Proportional to 105,429.05, 145,495.72 and 57,682.40

Step by Step Solution

1. Step 1: Write the proportion equation
   105,429.05 : 145,495.72 = 57,682.40 : x
2. Step 2: Convert to fraction form
   105,429.05/145,495.72 = 57,682.40/x
3. Step 3: Cross multiply
   105,429.05x = 145,495.72 × 57,682.40
4. Step 4: Simplify right side
   105,429.05x = 8,392,542,482.37
5. Step 5: Solve for x
   x = 8,392,542,482.37/105,429.05
6. Step 6: Final answer
   x = 79,603.70