Finding the Fourth Proportional to 12,945.86, 17,855.29 and 11,156.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.86 : 17,855.29 = 11,156.30 : x
2. Step 2: Convert to fraction form
   12,945.86/17,855.29 = 11,156.30/x
3. Step 3: Cross multiply
   12,945.86x = 17,855.29 × 11,156.30
4. Step 4: Simplify right side
   12,945.86x = 199,198,971.83
5. Step 5: Solve for x
   x = 199,198,971.83/12,945.86
6. Step 6: Final answer
   x = 15,387.08