Finding the Fourth Proportional to 11,123.28, 15,345.76 and 7,143.84

Step by Step Solution

1. Step 1: Write the proportion equation
   11,123.28 : 15,345.76 = 7,143.84 : x
2. Step 2: Convert to fraction form
   11,123.28/15,345.76 = 7,143.84/x
3. Step 3: Cross multiply
   11,123.28x = 15,345.76 × 7,143.84
4. Step 4: Simplify right side
   11,123.28x = 109,627,654.12
5. Step 5: Solve for x
   x = 109,627,654.12/11,123.28
6. Step 6: Final answer
   x = 9,855.69