Finding the Fourth Proportional to 11,154.33, 15,388.73 and 7,121.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,154.33 : 15,388.73 = 7,121.31 : x
2. Step 2: Convert to fraction form
   11,154.33/15,388.73 = 7,121.31/x
3. Step 3: Cross multiply
   11,154.33x = 15,388.73 × 7,121.31
4. Step 4: Simplify right side
   11,154.33x = 109,587,966.03
5. Step 5: Solve for x
   x = 109,587,966.03/11,154.33
6. Step 6: Final answer
   x = 9,824.70