Finding the Fourth Proportional to 11,111.43, 15,321.56 and 7,131.03

Step by Step Solution

1. Step 1: Write the proportion equation
   11,111.43 : 15,321.56 = 7,131.03 : x
2. Step 2: Convert to fraction form
   11,111.43/15,321.56 = 7,131.03/x
3. Step 3: Cross multiply
   11,111.43x = 15,321.56 × 7,131.03
4. Step 4: Simplify right side
   11,111.43x = 109,258,468.35
5. Step 5: Solve for x
   x = 109,258,468.35/11,111.43
6. Step 6: Final answer
   x = 9,832.98