Finding the Fourth Proportional to 9,390.72, 12,959.52 and 5,199.36

Step by Step Solution

1. Step 1: Write the proportion equation
   9,390.72 : 12,959.52 = 5,199.36 : x
2. Step 2: Convert to fraction form
   9,390.72/12,959.52 = 5,199.36/x
3. Step 3: Cross multiply
   9,390.72x = 12,959.52 × 5,199.36
4. Step 4: Simplify right side
   9,390.72x = 67,381,209.91
5. Step 5: Solve for x
   x = 67,381,209.91/9,390.72
6. Step 6: Final answer
   x = 7,175.30