Finding the Fourth Proportional to 3,978.54, 5,967.99 and 1,205.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.54 : 5,967.99 = 1,205.61 : x
2. Step 2: Convert to fraction form
   3,978.54/5,967.99 = 1,205.61/x
3. Step 3: Cross multiply
   3,978.54x = 5,967.99 × 1,205.61
4. Step 4: Simplify right side
   3,978.54x = 7,195,068.42
5. Step 5: Solve for x
   x = 7,195,068.42/3,978.54
6. Step 6: Final answer
   x = 1,808.47