Finding the Fourth Proportional to 5,097.78, 7,645.85 and 1,399.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,097.78 : 7,645.85 = 1,399.15 : x
2. Step 2: Convert to fraction form
   5,097.78/7,645.85 = 1,399.15/x
3. Step 3: Cross multiply
   5,097.78x = 7,645.85 × 1,399.15
4. Step 4: Simplify right side
   5,097.78x = 10,697,691.03
5. Step 5: Solve for x
   x = 10,697,691.03/5,097.78
6. Step 6: Final answer
   x = 2,098.50