Finding the Fourth Proportional to 73,978.46, 102,091.04 and 39,987.61

Step by Step Solution

1. Step 1: Write the proportion equation
   73,978.46 : 102,091.04 = 39,987.61 : x
2. Step 2: Convert to fraction form
   73,978.46/102,091.04 = 39,987.61/x
3. Step 3: Cross multiply
   73,978.46x = 102,091.04 × 39,987.61
4. Step 4: Simplify right side
   73,978.46x = 4,082,377,168.64
5. Step 5: Solve for x
   x = 4,082,377,168.64/73,978.46
6. Step 6: Final answer
   x = 55,183.32