Finding the Fourth Proportional to 72,174.54, 99,596.82 and 39,907.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72,174.54 : 99,596.82 = 39,907.28 : x
2. Step 2: Convert to fraction form
   72,174.54/99,596.82 = 39,907.28/x
3. Step 3: Cross multiply
   72,174.54x = 99,596.82 × 39,907.28
4. Step 4: Simplify right side
   72,174.54x = 3,974,638,182.85
5. Step 5: Solve for x
   x = 3,974,638,182.85/72,174.54
6. Step 6: Final answer
   x = 55,069.81