Finding the Fourth Proportional to 9,345.20, 12,890.76 and 7,352.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,345.20 : 12,890.76 = 7,352.72 : x
2. Step 2: Convert to fraction form
   9,345.20/12,890.76 = 7,352.72/x
3. Step 3: Cross multiply
   9,345.20x = 12,890.76 × 7,352.72
4. Step 4: Simplify right side
   9,345.20x = 94,782,148.87
5. Step 5: Solve for x
   x = 94,782,148.87/9,345.20
6. Step 6: Final answer
   x = 10,142.33