Finding the Fourth Proportional to 120,694.10, 166,442.13 and 72,288.27

Step by Step Solution

1. Step 1: Write the proportion equation
   120,694.10 : 166,442.13 = 72,288.27 : x
2. Step 2: Convert to fraction form
   120,694.10/166,442.13 = 72,288.27/x
3. Step 3: Cross multiply
   120,694.10x = 166,442.13 × 72,288.27
4. Step 4: Simplify right side
   120,694.10x = 12,031,813,632.82
5. Step 5: Solve for x
   x = 12,031,813,632.82/120,694.10
6. Step 6: Final answer
   x = 99,688.50