Finding the Fourth Proportional to 19,499.16, 26,930.70 and 13,200.60

Step by Step Solution

1. Step 1: Write the proportion equation
   19,499.16 : 26,930.70 = 13,200.60 : x
2. Step 2: Convert to fraction form
   19,499.16/26,930.70 = 13,200.60/x
3. Step 3: Cross multiply
   19,499.16x = 26,930.70 × 13,200.60
4. Step 4: Simplify right side
   19,499.16x = 355,501,398.42
5. Step 5: Solve for x
   x = 355,501,398.42/19,499.16
6. Step 6: Final answer
   x = 18,231.63