Finding the Fourth Proportional to 8,207.82, 11,293.98 and 7,978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,207.82 : 11,293.98 = 7,978.18 : x
2. Step 2: Convert to fraction form
   8,207.82/11,293.98 = 7,978.18/x
3. Step 3: Cross multiply
   8,207.82x = 11,293.98 × 7,978.18
4. Step 4: Simplify right side
   8,207.82x = 90,105,365.47
5. Step 5: Solve for x
   x = 90,105,365.47/8,207.82
6. Step 6: Final answer
   x = 10,978.00