Finding the Fourth Proportional to 9,208.18, 12,706.68 and 5,431.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,208.18 : 12,706.68 = 5,431.16 : x
2. Step 2: Convert to fraction form
   9,208.18/12,706.68 = 5,431.16/x
3. Step 3: Cross multiply
   9,208.18x = 12,706.68 × 5,431.16
4. Step 4: Simplify right side
   9,208.18x = 69,012,012.15
5. Step 5: Solve for x
   x = 69,012,012.15/9,208.18
6. Step 6: Final answer
   x = 7,494.64