Finding the Fourth Proportional to 16,978.84, 25,478.16 and 7,117.36

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.84 : 25,478.16 = 7,117.36 : x
2. Step 2: Convert to fraction form
   16,978.84/25,478.16 = 7,117.36/x
3. Step 3: Cross multiply
   16,978.84x = 25,478.16 × 7,117.36
4. Step 4: Simplify right side
   16,978.84x = 181,337,236.86
5. Step 5: Solve for x
   x = 181,337,236.86/16,978.84
6. Step 6: Final answer
   x = 10,680.19