Finding the Fourth Proportional to 8,969.50, 12,368.55 and 5,431.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,969.50 : 12,368.55 = 5,431.42 : x
2. Step 2: Convert to fraction form
   8,969.50/12,368.55 = 5,431.42/x
3. Step 3: Cross multiply
   8,969.50x = 12,368.55 × 5,431.42
4. Step 4: Simplify right side
   8,969.50x = 67,178,789.84
5. Step 5: Solve for x
   x = 67,178,789.84/8,969.50
6. Step 6: Final answer
   x = 7,489.69