Finding the Fourth Proportional to 72,065.46, 99,443.79 and 40,228.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,065.46 : 99,443.79 = 40,228.50 : x
2. Step 2: Convert to fraction form
   72,065.46/99,443.79 = 40,228.50/x
3. Step 3: Cross multiply
   72,065.46x = 99,443.79 × 40,228.50
4. Step 4: Simplify right side
   72,065.46x = 4,000,474,506.02
5. Step 5: Solve for x
   x = 4,000,474,506.02/72,065.46
6. Step 6: Final answer
   x = 55,511.68