Finding the Fourth Proportional to 10,998.57, 15,174.04 and 7,223.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,998.57 : 15,174.04 = 7,223.78 : x
2. Step 2: Convert to fraction form
   10,998.57/15,174.04 = 7,223.78/x
3. Step 3: Cross multiply
   10,998.57x = 15,174.04 × 7,223.78
4. Step 4: Simplify right side
   10,998.57x = 109,613,980.41
5. Step 5: Solve for x
   x = 109,613,980.41/10,998.57
6. Step 6: Final answer
   x = 9,966.20