Finding the Fourth Proportional to 3,978.42, 5,967.63 and 1,786.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.42 : 5,967.63 = 1,786.98 : x
2. Step 2: Convert to fraction form
   3,978.42/5,967.63 = 1,786.98/x
3. Step 3: Cross multiply
   3,978.42x = 5,967.63 × 1,786.98
4. Step 4: Simplify right side
   3,978.42x = 10,664,035.46
5. Step 5: Solve for x
   x = 10,664,035.46/3,978.42
6. Step 6: Final answer
   x = 2,680.47