Finding the Fourth Proportional to 16,978.58, 25,477.78 and 7,117.02

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.58 : 25,477.78 = 7,117.02 : x
2. Step 2: Convert to fraction form
   16,978.58/25,477.78 = 7,117.02/x
3. Step 3: Cross multiply
   16,978.58x = 25,477.78 × 7,117.02
4. Step 4: Simplify right side
   16,978.58x = 181,325,869.82
5. Step 5: Solve for x
   x = 181,325,869.82/16,978.58
6. Step 6: Final answer
   x = 10,679.68