Finding the Fourth Proportional to 105,150.42, 145,105.56 and 57,404.07

Step by Step Solution

1. Step 1: Write the proportion equation
   105,150.42 : 145,105.56 = 57,404.07 : x
2. Step 2: Convert to fraction form
   105,150.42/145,105.56 = 57,404.07/x
3. Step 3: Cross multiply
   105,150.42x = 145,105.56 × 57,404.07
4. Step 4: Simplify right side
   105,150.42x = 8,329,649,723.63
5. Step 5: Solve for x
   x = 8,329,649,723.63/105,150.42
6. Step 6: Final answer
   x = 79,216.51