Finding the Fourth Proportional to 11,123.76, 15,341.94 and 7,145.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,123.76 : 15,341.94 = 7,145.28 : x
2. Step 2: Convert to fraction form
   11,123.76/15,341.94 = 7,145.28/x
3. Step 3: Cross multiply
   11,123.76x = 15,341.94 × 7,145.28
4. Step 4: Simplify right side
   11,123.76x = 109,622,457.04
5. Step 5: Solve for x
   x = 109,622,457.04/11,123.76
6. Step 6: Final answer
   x = 9,854.80