Finding the Fourth Proportional to 120,900.72, 166,797.99 and 74,939.61

Step by Step Solution

1. Step 1: Write the proportion equation
   120,900.72 : 166,797.99 = 74,939.61 : x
2. Step 2: Convert to fraction form
   120,900.72/166,797.99 = 74,939.61/x
3. Step 3: Cross multiply
   120,900.72x = 166,797.99 × 74,939.61
4. Step 4: Simplify right side
   120,900.72x = 12,499,776,319.38
5. Step 5: Solve for x
   x = 12,499,776,319.38/120,900.72
6. Step 6: Final answer
   x = 103,388.77