Finding the Fourth Proportional to 120,401.38, 166,155.15 and 72,645.50

Step by Step Solution

1. Step 1: Write the proportion equation
   120,401.38 : 166,155.15 = 72,645.50 : x
2. Step 2: Convert to fraction form
   120,401.38/166,155.15 = 72,645.50/x
3. Step 3: Cross multiply
   120,401.38x = 166,155.15 × 72,645.50
4. Step 4: Simplify right side
   120,401.38x = 12,070,423,949.33
5. Step 5: Solve for x
   x = 12,070,423,949.33/120,401.38
6. Step 6: Final answer
   x = 100,251.54