Finding the Fourth Proportional to 9,876.72, 13,629.79 and 5,400.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,876.72 : 13,629.79 = 5,400.43 : x
2. Step 2: Convert to fraction form
   9,876.72/13,629.79 = 5,400.43/x
3. Step 3: Cross multiply
   9,876.72x = 13,629.79 × 5,400.43
4. Step 4: Simplify right side
   9,876.72x = 73,606,669.11
5. Step 5: Solve for x
   x = 73,606,669.11/9,876.72
6. Step 6: Final answer
   x = 7,452.54