Finding the Fourth Proportional to 10,390.91, 15,591.62 and 5,196.38

Step by Step Solution

1. Step 1: Write the proportion equation
   10,390.91 : 15,591.62 = 5,196.38 : x
2. Step 2: Convert to fraction form
   10,390.91/15,591.62 = 5,196.38/x
3. Step 3: Cross multiply
   10,390.91x = 15,591.62 × 5,196.38
4. Step 4: Simplify right side
   10,390.91x = 81,019,917.37
5. Step 5: Solve for x
   x = 81,019,917.37/10,390.91
6. Step 6: Final answer
   x = 7,797.20