Finding the Fourth Proportional to 11,426.86, 17,142.43 and 5,187.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,426.86 : 17,142.43 = 5,187.31 : x
2. Step 2: Convert to fraction form
   11,426.86/17,142.43 = 5,187.31/x
3. Step 3: Cross multiply
   11,426.86x = 17,142.43 × 5,187.31
4. Step 4: Simplify right side
   11,426.86x = 88,923,037.88
5. Step 5: Solve for x
   x = 88,923,037.88/11,426.86
6. Step 6: Final answer
   x = 7,781.93