Finding the Fourth Proportional to 10,809.25, 14,915.68 and 7,978.16

Step by Step Solution

1. Step 1: Write the proportion equation
   10,809.25 : 14,915.68 = 7,978.16 : x
2. Step 2: Convert to fraction form
   10,809.25/14,915.68 = 7,978.16/x
3. Step 3: Cross multiply
   10,809.25x = 14,915.68 × 7,978.16
4. Step 4: Simplify right side
   10,809.25x = 118,999,698.89
5. Step 5: Solve for x
   x = 118,999,698.89/10,809.25
6. Step 6: Final answer
   x = 11,009.06