Finding the Fourth Proportional to 10,128.72, 15,195.32 and 3,554.64

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.72 : 15,195.32 = 3,554.64 : x
2. Step 2: Convert to fraction form
   10,128.72/15,195.32 = 3,554.64/x
3. Step 3: Cross multiply
   10,128.72x = 15,195.32 × 3,554.64
4. Step 4: Simplify right side
   10,128.72x = 54,013,892.28
5. Step 5: Solve for x
   x = 54,013,892.28/10,128.72
6. Step 6: Final answer
   x = 5,332.75