Finding the Fourth Proportional to 9,121.54, 12,590.85 and 5,345.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,121.54 : 12,590.85 = 5,345.92 : x
2. Step 2: Convert to fraction form
   9,121.54/12,590.85 = 5,345.92/x
3. Step 3: Cross multiply
   9,121.54x = 12,590.85 × 5,345.92
4. Step 4: Simplify right side
   9,121.54x = 67,309,676.83
5. Step 5: Solve for x
   x = 67,309,676.83/9,121.54
6. Step 6: Final answer
   x = 7,379.20