Finding the Fourth Proportional to 9,391.52, 12,959.78 and 5,199.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.52 : 12,959.78 = 5,199.50 : x
2. Step 2: Convert to fraction form
   9,391.52/12,959.78 = 5,199.50/x
3. Step 3: Cross multiply
   9,391.52x = 12,959.78 × 5,199.50
4. Step 4: Simplify right side
   9,391.52x = 67,384,376.11
5. Step 5: Solve for x
   x = 67,384,376.11/9,391.52
6. Step 6: Final answer
   x = 7,175.02