Finding the Fourth Proportional to 213,142.72, 319,500.24 and 72,805.36

Step by Step Solution

1. Step 1: Write the proportion equation
   213,142.72 : 319,500.24 = 72,805.36 : x
2. Step 2: Convert to fraction form
   213,142.72/319,500.24 = 72,805.36/x
3. Step 3: Cross multiply
   213,142.72x = 319,500.24 × 72,805.36
4. Step 4: Simplify right side
   213,142.72x = 23,261,329,993.29
5. Step 5: Solve for x
   x = 23,261,329,993.29/213,142.72
6. Step 6: Final answer
   x = 109,135.00