Finding the Fourth Proportional to 12,566.24, 17,379 and 10,991.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,566.24 : 17,379 = 10,991.60 : x
2. Step 2: Convert to fraction form
   12,566.24/17,379 = 10,991.60/x
3. Step 3: Cross multiply
   12,566.24x = 17,379 × 10,991.60
4. Step 4: Simplify right side
   12,566.24x = 191,023,016.40
5. Step 5: Solve for x
   x = 191,023,016.40/12,566.24
6. Step 6: Final answer
   x = 15,201.29