Finding the Fourth Proportional to 5,443.18, 8,159.88 and 1,978

Step by Step Solution

1. Step 1: Write the proportion equation
   5,443.18 : 8,159.88 = 1,978 : x
2. Step 2: Convert to fraction form
   5,443.18/8,159.88 = 1,978/x
3. Step 3: Cross multiply
   5,443.18x = 8,159.88 × 1,978
4. Step 4: Simplify right side
   5,443.18x = 16,140,242.64
5. Step 5: Solve for x
   x = 16,140,242.64/5,443.18
6. Step 6: Final answer
   x = 2,965.22