Finding the Fourth Proportional to 72,137.55, 99,554.49 and 40,306.62

Step by Step Solution

1. Step 1: Write the proportion equation
   72,137.55 : 99,554.49 = 40,306.62 : x
2. Step 2: Convert to fraction form
   72,137.55/99,554.49 = 40,306.62/x
3. Step 3: Cross multiply
   72,137.55x = 99,554.49 × 40,306.62
4. Step 4: Simplify right side
   72,137.55x = 4,012,704,997.72
5. Step 5: Solve for x
   x = 4,012,704,997.72/72,137.55
6. Step 6: Final answer
   x = 55,625.75