Finding the Fourth Proportional to 9,875.49, 13,628.57 and 5,399.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,875.49 : 13,628.57 = 5,399.57 : x
2. Step 2: Convert to fraction form
   9,875.49/13,628.57 = 5,399.57/x
3. Step 3: Cross multiply
   9,875.49x = 13,628.57 × 5,399.57
4. Step 4: Simplify right side
   9,875.49x = 73,588,322.57
5. Step 5: Solve for x
   x = 73,588,322.57/9,875.49
6. Step 6: Final answer
   x = 7,451.61