Finding the Fourth Proportional to 120,442.53, 166,139.33 and 72,667.65

Step by Step Solution

1. Step 1: Write the proportion equation
   120,442.53 : 166,139.33 = 72,667.65 : x
2. Step 2: Convert to fraction form
   120,442.53/166,139.33 = 72,667.65/x
3. Step 3: Cross multiply
   120,442.53x = 166,139.33 × 72,667.65
4. Step 4: Simplify right side
   120,442.53x = 12,072,954,320.34
5. Step 5: Solve for x
   x = 12,072,954,320.34/120,442.53
6. Step 6: Final answer
   x = 100,238.30