Finding the Fourth Proportional to 13,189.50, 19,757.52 and 10,991.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,189.50 : 19,757.52 = 10,991.16 : x
2. Step 2: Convert to fraction form
   13,189.50/19,757.52 = 10,991.16/x
3. Step 3: Cross multiply
   13,189.50x = 19,757.52 × 10,991.16
4. Step 4: Simplify right side
   13,189.50x = 217,158,063.52
5. Step 5: Solve for x
   x = 217,158,063.52/13,189.50
6. Step 6: Final answer
   x = 16,464.47