Finding the Fourth Proportional to 9,876.18, 13,629.09 and 5,399.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,876.18 : 13,629.09 = 5,399.94 : x
2. Step 2: Convert to fraction form
   9,876.18/13,629.09 = 5,399.94/x
3. Step 3: Cross multiply
   9,876.18x = 13,629.09 × 5,399.94
4. Step 4: Simplify right side
   9,876.18x = 73,596,268.25
5. Step 5: Solve for x
   x = 73,596,268.25/9,876.18
6. Step 6: Final answer
   x = 7,451.90