Finding the Fourth Proportional to 105,255.39, 145,250.74 and 57,507.71

Step by Step Solution

1. Step 1: Write the proportion equation
   105,255.39 : 145,250.74 = 57,507.71 : x
2. Step 2: Convert to fraction form
   105,255.39/145,250.74 = 57,507.71/x
3. Step 3: Cross multiply
   105,255.39x = 145,250.74 × 57,507.71
4. Step 4: Simplify right side
   105,255.39x = 8,353,037,433.21
5. Step 5: Solve for x
   x = 8,353,037,433.21/105,255.39
6. Step 6: Final answer
   x = 79,359.71