Finding the Fourth Proportional to 9,340.80, 12,889.92 and 5,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,340.80 : 12,889.92 = 5,978.88 : x
2. Step 2: Convert to fraction form
   9,340.80/12,889.92 = 5,978.88/x
3. Step 3: Cross multiply
   9,340.80x = 12,889.92 × 5,978.88
4. Step 4: Simplify right side
   9,340.80x = 77,067,284.89
5. Step 5: Solve for x
   x = 77,067,284.89/9,340.80
6. Step 6: Final answer
   x = 8,250.61