Finding the Fourth Proportional to 9,895.57, 13,655.79 and 5,419.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,895.57 : 13,655.79 = 5,419.31 : x
2. Step 2: Convert to fraction form
   9,895.57/13,655.79 = 5,419.31/x
3. Step 3: Cross multiply
   9,895.57x = 13,655.79 × 5,419.31
4. Step 4: Simplify right side
   9,895.57x = 74,004,891.03
5. Step 5: Solve for x
   x = 74,004,891.03/9,895.57
6. Step 6: Final answer
   x = 7,478.59