Finding the Fourth Proportional to 5,978.80, 8,969.03 and 2,646.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,978.80 : 8,969.03 = 2,646.78 : x
2. Step 2: Convert to fraction form
   5,978.80/8,969.03 = 2,646.78/x
3. Step 3: Cross multiply
   5,978.80x = 8,969.03 × 2,646.78
4. Step 4: Simplify right side
   5,978.80x = 23,739,087.96
5. Step 5: Solve for x
   x = 23,739,087.96/5,978.80
6. Step 6: Final answer
   x = 3,970.55