Finding the Fourth Proportional to 6,978.49, 9,623.46 and 6,402.25

Step by Step Solution

1. Step 1: Write the proportion equation
   6,978.49 : 9,623.46 = 6,402.25 : x
2. Step 2: Convert to fraction form
   6,978.49/9,623.46 = 6,402.25/x
3. Step 3: Cross multiply
   6,978.49x = 9,623.46 × 6,402.25
4. Step 4: Simplify right side
   6,978.49x = 61,611,796.79
5. Step 5: Solve for x
   x = 61,611,796.79/6,978.49
6. Step 6: Final answer
   x = 8,828.81