Finding the Fourth Proportional to 5,443.42, 8,168.78 and 1,980.67

Step by Step Solution

1. Step 1: Write the proportion equation
   5,443.42 : 8,168.78 = 1,980.67 : x
2. Step 2: Convert to fraction form
   5,443.42/8,168.78 = 1,980.67/x
3. Step 3: Cross multiply
   5,443.42x = 8,168.78 × 1,980.67
4. Step 4: Simplify right side
   5,443.42x = 16,179,657.79
5. Step 5: Solve for x
   x = 16,179,657.79/5,443.42
6. Step 6: Final answer
   x = 2,972.33