Finding the Fourth Proportional to 8,978.79, 13,456.30 and 6,890.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.79 : 13,456.30 = 6,890.82 : x
2. Step 2: Convert to fraction form
   8,978.79/13,456.30 = 6,890.82/x
3. Step 3: Cross multiply
   8,978.79x = 13,456.30 × 6,890.82
4. Step 4: Simplify right side
   8,978.79x = 92,724,941.17
5. Step 5: Solve for x
   x = 92,724,941.17/8,978.79
6. Step 6: Final answer
   x = 10,327.11