Finding the Fourth Proportional to 11,399.40, 15,738.38 and 7,820.34

Step by Step Solution

1. Step 1: Write the proportion equation
   11,399.40 : 15,738.38 = 7,820.34 : x
2. Step 2: Convert to fraction form
   11,399.40/15,738.38 = 7,820.34/x
3. Step 3: Cross multiply
   11,399.40x = 15,738.38 × 7,820.34
4. Step 4: Simplify right side
   11,399.40x = 123,079,443.55
5. Step 5: Solve for x
   x = 123,079,443.55/11,399.40
6. Step 6: Final answer
   x = 10,797.01