Finding the Fourth Proportional to 9,679.97, 13,358.12 and 5,431.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,679.97 : 13,358.12 = 5,431.05 : x
2. Step 2: Convert to fraction form
   9,679.97/13,358.12 = 5,431.05/x
3. Step 3: Cross multiply
   9,679.97x = 13,358.12 × 5,431.05
4. Step 4: Simplify right side
   9,679.97x = 72,548,590.47
5. Step 5: Solve for x
   x = 72,548,590.47/9,679.97
6. Step 6: Final answer
   x = 7,494.72