Finding the Fourth Proportional to 120,571.72, 166,423.62 and 72,817

Step by Step Solution

1. Step 1: Write the proportion equation
   120,571.72 : 166,423.62 = 72,817 : x
2. Step 2: Convert to fraction form
   120,571.72/166,423.62 = 72,817/x
3. Step 3: Cross multiply
   120,571.72x = 166,423.62 × 72,817
4. Step 4: Simplify right side
   120,571.72x = 12,118,468,737.54
5. Step 5: Solve for x
   x = 12,118,468,737.54/120,571.72
6. Step 6: Final answer
   x = 100,508.38