Finding the Fourth Proportional to 16,980.42, 23,416.65 and 13,198.17

Step by Step Solution

1. Step 1: Write the proportion equation
   16,980.42 : 23,416.65 = 13,198.17 : x
2. Step 2: Convert to fraction form
   16,980.42/23,416.65 = 13,198.17/x
3. Step 3: Cross multiply
   16,980.42x = 23,416.65 × 13,198.17
4. Step 4: Simplify right side
   16,980.42x = 309,056,927.53
5. Step 5: Solve for x
   x = 309,056,927.53/16,980.42
6. Step 6: Final answer
   x = 18,200.78