Finding the Fourth Proportional to 199,331.78, 298,748.57 and 142,317.23

Step by Step Solution

1. Step 1: Write the proportion equation
   199,331.78 : 298,748.57 = 142,317.23 : x
2. Step 2: Convert to fraction form
   199,331.78/298,748.57 = 142,317.23/x
3. Step 3: Cross multiply
   199,331.78x = 298,748.57 × 142,317.23
4. Step 4: Simplify right side
   199,331.78x = 42,517,066,743.53
5. Step 5: Solve for x
   x = 42,517,066,743.53/199,331.78
6. Step 6: Final answer
   x = 213,297.99