Finding the Fourth Proportional to 105,245.12, 145,238.37 and 57,499.27

Step by Step Solution

1. Step 1: Write the proportion equation
   105,245.12 : 145,238.37 = 57,499.27 : x
2. Step 2: Convert to fraction form
   105,245.12/145,238.37 = 57,499.27/x
3. Step 3: Cross multiply
   105,245.12x = 145,238.37 × 57,499.27
4. Step 4: Simplify right side
   105,245.12x = 8,351,099,672.27
5. Step 5: Solve for x
   x = 8,351,099,672.27/105,245.12
6. Step 6: Final answer
   x = 79,349.04