Finding the Fourth Proportional to 7,172.79, 9,904.98 and 5,401.32

Step by Step Solution

1. Step 1: Write the proportion equation
   7,172.79 : 9,904.98 = 5,401.32 : x
2. Step 2: Convert to fraction form
   7,172.79/9,904.98 = 5,401.32/x
3. Step 3: Cross multiply
   7,172.79x = 9,904.98 × 5,401.32
4. Step 4: Simplify right side
   7,172.79x = 53,499,966.57
5. Step 5: Solve for x
   x = 53,499,966.57/7,172.79
6. Step 6: Final answer
   x = 7,458.74