Finding the Fourth Proportional to 145,499.57, 200,723.38 and 105,149.42

Step by Step Solution

1. Step 1: Write the proportion equation
   145,499.57 : 200,723.38 = 105,149.42 : x
2. Step 2: Convert to fraction form
   145,499.57/200,723.38 = 105,149.42/x
3. Step 3: Cross multiply
   145,499.57x = 200,723.38 × 105,149.42
4. Step 4: Simplify right side
   145,499.57x = 21,105,946,987.44
5. Step 5: Solve for x
   x = 21,105,946,987.44/145,499.57
6. Step 6: Final answer
   x = 145,058.48