Finding the Fourth Proportional to 11,103.89, 15,328.74 and 7,131.75

Step by Step Solution

1. Step 1: Write the proportion equation
   11,103.89 : 15,328.74 = 7,131.75 : x
2. Step 2: Convert to fraction form
   11,103.89/15,328.74 = 7,131.75/x
3. Step 3: Cross multiply
   11,103.89x = 15,328.74 × 7,131.75
4. Step 4: Simplify right side
   11,103.89x = 109,320,710.76
5. Step 5: Solve for x
   x = 109,320,710.76/11,103.89
6. Step 6: Final answer
   x = 9,845.27