Finding the Fourth Proportional to 8,484.54, 12,673.20 and 7,172.34

Step by Step Solution

1. Step 1: Write the proportion equation
   8,484.54 : 12,673.20 = 7,172.34 : x
2. Step 2: Convert to fraction form
   8,484.54/12,673.20 = 7,172.34/x
3. Step 3: Cross multiply
   8,484.54x = 12,673.20 × 7,172.34
4. Step 4: Simplify right side
   8,484.54x = 90,896,499.29
5. Step 5: Solve for x
   x = 90,896,499.29/8,484.54
6. Step 6: Final answer
   x = 10,713.19